After lurking for weeks I'm compelled to post. Forgive the lack of pictures- I'll post them later this week.
I did my first BKT 3 weeks ago using dream hair (I was 4 weeks post relaxer, my hair is 4a/b, fine, dry, cottony). I was like the poster child for BKT! Soft, silky, shiny hair with swang! I couldn't believe it. The one thing I didn't like was the cooked-hair smell. When I washed my hair the first time it was soft and not frizzy (air dried), like a fresh relaxer but with roots. While I was not losing tons of hair like I always do when I have new growth I noticed some broken pieces of hair on the sink. Nothing major,but it concerned me because it was not my normal pattern. I suspected I had damaged some of my ends because I even though I was careful to cover all my strands I actually used very little product (in my opinion). But since I wasn't seeing my usual handful of broken long hairs I was so encouraged that I decided to order some global 4% to try and tame the roots (using the babyliss root iron). I did my 2nd bkt yesterday. The results were not fantastic. Actually, it was kind of awful.
I followed the directions, did it as before but I somehow used more product and my hair felt more coated. I was disappointed when I started flat ironing and my hair didn't react as before: I didn't fall as nicely, it smelled burnt, and it WASN'T SHINY! Long story short. I ended up with a dull, slightly stiff, head of fragile hair. I've got lots of short (1/2 inch broken pieces) along with longer (3-5 inches) ones. I was so upset I washed and conditionded (with coppola keratin condish) my hair today, followed by Aphogee green tea/keratin spray. It looks and feels better, but not BKT'd.
So this is why I'm posting: It seems like the common link among the people not so thrilled with BKT is RELAXED HAIR. Frankly, even after my mostly positive Dream Hair experience I was slightly underwhelmed. I just kept thinking: "what's the point?" my hair is already straight and the roots are still crunchy. In fact, I got very positive results a few weeks before my first BKT just using Aphogee protein treatment followed by green tea spray and curling iron (with and iron that now seems COLD compared to the heat from the babyliss titanium nano I used for the BKT). It was a lot cheaper, less labor intensive, less traumatic and DID NOT DAMAGE MY HAIR!
Don't get me wrong-I still think BKT has potential for me, but I'll wait until I have a lot more new growth. This post has inspired me to attempt to go natural ( I'm really bored with relaxing) and I had hoped that BKT would be the best option to ease the transition...But, maybe not.
Thank you for posting this, it's people like you who I like to ask questions and find out what went wrong. I keep hearing that technically this treatment is made for relaxed hair but maybe it depends on the condition of the relaxed hair in the first place. Would you consider your relaxed hair in pretty good shape before the BKT? You said you noticed a cooked hair smell. For the first time ever I DIDN'T notice that on my head after doing BKT. Any other time I flat iron on lower temps and I get the cooked smell and my hair breaks. I think if you hair smells that is a sign that the heat is too high and it's not really being protected. Do you think you distributed the treatment evenly and what temp did you have the iron on?
This is a learning process for many of us and unfortunately for some there may be some damaging mistakes done until we get it down but if you are going to try it again at some point I'd stick with Dreamhair since it worked pretty well for you.
BTW-I haven't tried it yet but from what I hear less is more with Global. You can get away with using more Dreamhair without the stiff feeling but Global is not as forgiving in that area. I am going to try Global 4% next and if I don't like it I'm going back to Dreamhair and staying put.

Mystic said her hair is thinning from just two treatments and is near ruined. So what's different about us? What's the common factor in those who's hair thrives on BKT and those who's hair crumbles?
It's impossible to know what other people's hair is really like, or how they are actually applying it. Some people might have an aversion to certain chemicals, too.
I'd have to agree that it must be other conditions that are making those individuals have such negative experiences. Maybe they used too much heat? Not enough product? Not enough passes with the flat iron to seal the keratin to their hair while continuing to flat iron on a regular basis? Not sticking to their original regimen after the treatment (except for the non sulfate products)? Having really damaged hair BEFORE using BKT? i mean keratin is the building blocks of hair itself! How can adding keratin to strengthen the hair be bad for you?
and e-::hardslap:... and I can't take it. I know that my hair thrives and each one of the 5 other heads that I have done it on have as well. I DON'T KNOW NOBODY IRL that I have done it or who has gotten it and has had a bad experience...and lets remember my IRL friends are not LHCF alum who know moisture/protein balance "extraness"... but regular every two weeks going to the salon chicks who do NOTHING to their hair in between. So I just stay away and I have decided that I can't save everybody ... so when people start that yapping... I just go to my happy spot and play with my hair and buy some BKT or other hair products. And I'm just gangsta to say that they didn't follow the directions or left some crucial part out. So there. 

. It was really rough, with wiry ends (but no split ends) and got somewhat bleached (looked like I got highlights). I September I started researching and found Dr. Sayed's blog (he works for AVLON/Syntonics) which gave me the idea to do protein treatment right after rinsing the relaxer off because the cuticle is open. I did this with my last relaxer (some time in late Sept or early Oct--not sure) and it worked pretty well. It was then that I found out about BKT and started researching it. That led me back to this forum. I had joined back in May but never really participated. In early October, I paid for full membership privileges so I could look at all the cool pictures of all the beautiful hair (You guys are an inspiration!).
. The Biotique stuff is really, really wonderful. You can find it online but
when I saw you listing those new products....
. I keep loosing this when I preview)
That's how it's been with every BKT for me. I'm in love after the first wash; but while product in... eh