I tried a sample of the Super Sweetback treatment. I think the difference between Super Sweetback and Rapid Recovery is that RR has protein and SS does not, but I could be wrong.
I actually tried both and both made my hair soft. I did not like the smell of Super Sweetback. It has a strong cherry smell. I used SS with heat for 30 minutes, then followed with a leave-in conditioner. I used Curly Meringue and did a braidout that came out nice and fluffy and soft. I probably would not buy a full size of SS because of the price and smell, but it did work well.
I absolutely love Curly Meringue and I have a big jar of it that's almost empty. I also like Stretch Silkening Creme. It has the softest hold of the styling cremes that I've tried. I returned the Super Slip Sudsy shampoo. It just didn't seem like anything special to me. It did provide slip, though.
BTW, Miss Jessie's has free shipping on orders over $30 right now.
An alternative to Miss Jessie's is Uncle Funky's. They have similar products for a similarly high price, but more natural ingredients.