I owned a HA4000/Pro 4200 rig for a good while and it's a good solid cab. It definitely has the Hartke flavor... I often turned the horn off and still got quite a bright tone, but it did still have some good meat to it and always got lots of compliments. Like Flogger and Kael said though, it's a beast of a cab. That was my only real qualm with it, it weighed 127lbs. It's got wheels, but carrying it up and down three flights (no elevator) sure got to be a chore.
You should be just fine pushing it with 450 watts, the HA4000 I was pushing it with 400, no trouble.
5sg.
