For me the hairline isn't really an issue, nor is the blend on the back and sides. I don't know why so many worry about blending. All I do is bond a new piece, get the hair clippers set to my preffered length and trim my own hair and the piece hair. That gets a perfect blend as all thehair is the same length at the blend areas. Then I clipper my hair ever other day. It takes 2 minutes and keeps the blend perfect all the time.

The real concern for me is the crown. I have never had a realistic looking crown. With dark hair the knots are a problem and if anyone standing behind me in a long line took a look they'd see something was not right. I am working on a solution though.