I have used Extreme for 8 years with no problems and I now only use it for prom nails and holiday nails, its great to work with, its a hybrid acrylic system that uses resin with the acrylic instead of liquid, the pros of Extreme Powder Glaze is it is easy to use, it creates some lovely nails and a set can be achieved in 45mins, cons mmm, others have said that the nails only last 2weeks, I have had clients who have had theirs on for 4 weeks with no problems at all, though i have drummed in aftercare with them lol, I have never been able to sculpt with it which frustrates me but hey over tips its great.
I have since retrained in L&P and I love it more than my tip and dip (Oh my cant believe I've said that lol)
hth
Sue xx