No site is safe from either hackers or colluders. The US government has been hacked, and they spent a lot more to avoid it. I play on Spade Club to have fun. I don't think it is either hacked or in daily games is it worthwhile to collude. The Sunday big games probably have some colluders, but they have to get in position to make it work. Possible, but not too likely. There is constant collusion in live games, in particular cash games. So mellow out, and have lots of fun for $20.00/month.
Alarcon
I fully agree with you. Dont forget about players also having more then one account. Likeon pokerstars where a player made the final table of the sunday millions with both accounts. But heres another thing to think about when you think the online sites are not secure. on Full tilt the pros play for hundred of thousands of dollars and i dont think they would play if it wasnt secure.