I'm not trying to scare you off the thing, but just be careful with it. It seems that the gel (unless there is some special brand I'm not aware of) does to your nails the same thing the nylon socks do to your feet. It prevents normal breathing of the skin underneath the nail (or whatever people have down there) and there's always a risk of developing a fungal infection.
I haven't tried it, but a friend of mine had. At first he was delighted. He told me that he can finally play at high volume without the subconscious inhibiting fear of breaking the nails. After a couple of months he suffered an infection (apparently as a result of a tiny injury during the treatment, not a fungal one) so bad that it had to be cured by antibiotics.
Well, in spite of that, he is still using gel nails. Knowing how hypochondriacal that firend of mine can be, I guess the benefits of gel nails might be worth the risks.