Warning, It's been about 18 days since the last response from this person and I have yet to receive his part of the trade or a response, though he's been online multiple times in the time passed. I highly suggest against trading with him =(
Amy I'm pretty sure the whole "at your own risk" thing still stands true (Like they obviously won't be replacing any lost cards, etc.) but usually they have some sort of trading system to make up for it, like how they used to have a rate/trade system for AC Gamecube cards (and the Wifi rate system) so we can warn other users if the person is any good or not... though since it's real life and not just like, Wifi or something, I'd like to think that they can have some kind of consequence against someone not keeping their end of the bargain multiple times (like here) and maybe ban them or something, or put some kind of marker on their lookup to indicate that this person isn't reliable for trading with... because it's a real shame when it happens v_v
Back in the day, I used this site to trade e-reader cards. The feedback system worked then. You might be more hesitant about trading 15 cards to someone who has never traded on the site before. I was pretty disappointed when I logged in years later to find that the whole card trade system was broken. Although, I WAS pleased that my account was still here.