i've bought fuse holders, fuses, 3/0 and 2/0 ring terminals. the ring terminals ends are thicker than normal ones used. I didn't have any problems with anything i ordered though.
never heard of em, but just looking at the specs from their website 3300 @ 1 ohm but only 4600 @ 2 ohm strapped seems kind of strange. also the 20-55hz response is eh?..