Hi there
I trained with Bio after having trained with CND for L&P, just hated the idea of buffing off gels. Yes Bio stuff is quite expensive but the gels do last quite a while and if you're pricing is right you should recover the cost quite quickly.
Bio is fab over natural nails, and really helps a client to grow their nails if they so wish. It's not so strong over tips or overlays but sometimes that is due to the client not caring for her nails (you soon find out who is used to long nails and who isn't). The new S Gel is supposed to be a lot stronger shall be trying that soon.
Fab colours which clients really love, no chipping or flaking off like polish, dead easy to use, I only ever noticed it go slightly yellow with a customer who smoked, maybe a top coat over it would prevent it discolouring.
I've had a play with brisa, seems nice and quite soft to buff, didn't last 5 minutes on 1 client over her natural nails, so changed to bio and they've lasted her really well even with her swimming 3 times a week.
Regards
Deb379