Insanely high power usage. Around 100-150 watts idle, and 300+ at load (and that's without overclocking). And those benchmarks are only based on a single test. I'd recommend looking at an all round review for deciding. From what I can remember they're still way below the Intel CPU's in gaming but about equal for number crunching.
I think those stats are for the whole system not just the CPU. Not fair to dump it all on it without a disclaimer.
@OP: Scratch the x1xx and x2xx because they're Bulldozer which is a bit slower and less efficient, unless you find an awesome deal or something. FXs are slower when it comes to performance per core, but as the game is more optimised for multi-threading the gap decreases. The # or cores should make them better for general usage too. Boards are also cheaper and the current socket should support next gen Steamroller, while Intel's 1155 will be replaced with 1150 for their next gen Haswell.