I was skeptical at first, and only bought in to take advantage of all those online casino promos that they always have. I started off playing very low limit games until I got the feel for things. I am now playing $20 buy in no limit texas hold em games, where 10 people put up $20, first takes $100, second takes $60, third takes $40, everyone else gets nada. There are a TON of "newb" players who don't have very much skill, and I am finding that I can consistently place in the top 3. Of course you always have a few off games, but it balances out. I would not trust my real money on a flash game though...The main casino sites are partypoker.com, empirepoker.com, pokerstars.com, and a few others. Basically, not of the popular established sites offer mac clients. Just a few minutes ago I played 2 games at once, got first at one table and second at the other, not bad to make $160 in about 40 minutes.