I'm a licensed cosmetologist and I lived these extensions! I installed one pack in this photo of 20inch wefts, using the beaded weft sew in method and they had very thin seams on top which made it easy to sew in and blend with the hair! She had fine hair so we only needed one pack but I'd suggest getting 2 packs if you have fuller hair.
So far so good. I used these extensions for ''hand tied'' method. These were colored along with my hair. They seem like such good quality, however I've only had them in for a day. Will update if anything changes!