Actually it's 1.2kw into 2 ohms. As Chris said, the EP2500 makes more sense for more power. I bought it to drive power hungry subs, but I now run my mains from it. It doesn't have audiophile snob value, but I don't find it to be lacking in anything. The fan is a bit noisy and it runs all the time. There is info online in how to change the fan to one you won't hear, not that hard to fix. The amp doesn't have muting relays, however, it seems to employ some method of protection since I have turn on transients that come through on other amps but EP2500 they are reduced to almost nothing. I think it has to do with the time taken to charge up the caps in the PS because if you turn it off after use, then immediately on again you get an almighty thump. Caused by other components, that is.
The A500 can only be bridged into 8 ohms, but EP2500 will put 2.4kw into 4 ohms bridged! That gives it a lot of flexibility and makes it ideal as a monster sub amp. It's ideally suited to locking away in a concealed AV cabinet rack mounted.
I haven't done any critical listening comparisons to other amps, but I suspect that at most you would find a very subtle difference, the kind you have to listen very carefully for, playing the one track back over and over with only changing amps.
It's a class H, not to be confused with switching amps. It's really Class AB with a different power supply.
The beauty of an amp like this is that the only way you will get it to clip in a home environment is when driving very high power subs. I've only seen the clipping lights twice in the last few years.