I've never actually owned a full weft of Wagman or Extensions-Plus hair. Both companies do offer samples though. I have purchased hair from Halley's Curls a few times though.
With Wagman they ship their samples out free (except the virgin textures) and you can call and order. You can specify exactly what you want and they will try to match it. The perfect tress line has no beards, does not shed and come in a variety of processed textures. The virgin line has been know to shed some without sealing and does shed a bit. They often have very curly hair in stock. You can also easily purchase bulk hair and can get an up-to-date price list of all of their products.
With EP they also ship out samples. Their samples cost I believe $3 and you have a limit of 3 at a time. If you have to order anything that can't be purchased online or want to request something in particular then you have to fax them your credit card info. You can not make a call in order with out your faxed in info. This is somewhat limiting. Who has time to fax or even has a fax machine. They dont accept scans either. Also, their samples do shed and the hair is quite expensive. The virgin hair samples of both straight and curly weren't impressive to me. The curls was barely a wave and the hair had lots of shine versus a soft sheen. Now their relaxed texture is superb. It does resemble relaxed hair and will act just like it unlike most yaki textures. I would consider this hair more kinky straight than yaki. It can be straightened to look like yaki texture if needed. Since I only installed the sample and not a whole head of the stuff Im not sure how it really acts as a whole.
Halley's curl is a hit and miss. The only hair that I was satisfied with was their virgin indian line which they discontinued. This hair had a nice sheen and had micro handtied wefts. The hair also didn't shed either. I only tried one of their earlier processed textures and it was beautiful before it turned into a big bird's nest. Many others have complained about their current products and costumer service. I never had problems with customer service but I also haven't purchased from them recently. The hair that seems to have the most praise is the salon relaxed texture. I cant say too much about it because I no experience with it. If there are problems with the hair, currently it has been the hair feeling dried out, loosing its sheen or not holding a curl. Also, I dont think Halley's has costumer service by phone. That might have changed though.