Aced.com is the same like Carbon, used to be just another skin on merge network but was buy for the same owners than Carbon (or was take it by merge or something on those lines). You even can Transfer to yourself from Carbon/Aced like Absolute/UB (or used to be that way), I remember Private games usually appear on both sites, so if a game is on carbon you could played from Aced, (usually is this way on all merge network but each skin have his own private games but Carbon/Aced share those too).
Have some time that not play there but is a trusted site, but there is no reason to play there if can play on Carbon.