I just don't 'get it' - they're full cover nails no different to those cheapies sold in Primark, supermarkets, Boots, etc. Why would a client pay me to stick on something they can do themselves, and at a much cheaper price than I will charge for my skills and time.
I know they are marketed with all sorts of claims about being 'gel tips', they are plastic like any other tip as Gel is part of the plastic family, they're marketed as being attached with 'gel', which is being used as a fancy name for resin, which is adhesive.
You can't build in any strength, form or apex., and most of the reports I've heard are that they pop off after a few days, again, not much more longevity than cheapie DIY stick ons.
I can see maybe a use in the 'party nails' idea but they're harder to remove than cheapie ones so defeat the object