Never tried them but it's most important that it has provaly fair future, also research the site and their terms and conditions..
I try this many time and every time out of this with empty wallet never win here even Holdaaja give me some bounty
This site is provably fair.
I'm 0.14
BTC on profit there
Have you got any TX links from the site actually sending btc to your wallet perhaps?
There you go (withdrawal number/date and time/amount of btc/tx id):
1 2014-03-26 19:05 0.05000000 9041da91e1b592d1beb5a9ed0711e5832b01bd7e7253dbc400e09c941cdeecdf
2 2014-03-27 22:32 0.43673281 90fa70a238eac808409a5e7aab04909140a9aab89dcf936dc7b7ddf4055f4193
3 2014-03-28 18:50 0.50000000 079da0786494f75a0f486954475cbb1fef13690c537fda4e2df1dadcfd738aae
4 2014-03-28 19:35 0.22814996 d9c95a7302a9d9bc2f2ee5127812838d9eb6ebe1798371c69db80c396959066c
5 2014-03-29 21:54 0.01216175 768675987e7b757980abb532a96f3fd2cda18dbeb5eef3f893e42d94ebb93fb5
6 2014-04-11 17:41 0.03036528 63e91b12d76d76d6c12ec9d73bc1b289a8f116c56fac882cc0cadecdd6da4ba3