Short answer: Yes!
Long answer: Read some pages and you'll find that none of the investors had problems with payment and so on. The site often is down, but it always return and to conclude I'd say what many people said here and you can apply to any investment site: Every investment is a risk, so invest what you can afford to lose (or something similar). I intend to buy a level 3 mine using the money I got from faucets, this is what I can afford to lose. Anyway, if I were you, I'd read the entire topic (yes, I did this).  (Sorry about the bad english)