Same here. I do trades, lending and cashing-out with substantial amounts for several months now. I am especially pleased with their fast, friendly and competent customerservice.
When I was all new to Bitcoin I was all new to trading, speculation and all this too. So I read a bit, got newsletters and observed the market. And lost a lot of money on MtGox doing bad trades. I thought I then had learned how this game goes, and then I lost more. Then I made some profit. Then I lost even more. Then I stopped. This was my best trading decision ever. :-)
I only traded with a part of my Bitcoins. Enough to hurt, but not enough to really hurt.
I don't know how experienced you are, Tamis. I would suggest to trade with 10% of your Bitcoins only, for a start. And maybe with a token amount only until you figure out how all those functions work. They are all well documented, but you still has to wrap your head around them. And then there are details, like for example "what lending gets automatically closed when I sell?" which you simply have to try out. With 0.01 BTC for example.
So, no, I don't see BitFinex as the risk here, we ourselves are the risk for our Bitcoins ;-)
Ente