I've played at Party, Pacific and UB.
Pacific I'm not even going to go there, waste of time, garbage site, except for the fact I got a nice $125 chip set absolutely free
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Party is good. I'm sure most, if not all, have played there. I just got really pissed with the amount of bad beats I was taking from that site. Really pissed me off. Plus, once my bonus was received, I saw no point gambling my money when I can go to another site, gamble my money and get more free money.
UB is the best. They have 50% re-loads every once and a while, so whenever my bonus $s run out, I take a couple weeks off of poker, cash out most of what's in there, wait for the re-load, and then dump my money back in. Repeat, lather, rinse, repeat, and I have made a ton off that site.