BIAB quality really depends on who you get. My first visit was great - probably the best my nails have looked. My last two visits were with a different technician, and the standard was much lower: patchy, uneven application that chipped and lifted at the tips and cuticles. Disappointing, and it makes me hesitant to rebook when I can't be sure who I'll get.
It seems technicians use quite different techniques, which really shows in the quality and look of the nails.