I know this thread is an oldie but....
I finally picked up one of these heads last week. Got it at Long & McQuade's here in Toronto for $920 CAD+tax. (I'm sure this price will go up very soon with the exchange getting worse over time.) So far it's amazing. Way more headroom than the Aguilar Tone Hammer 500 I was using previously. As far as I can tell so far, it has a way warmer tone than the TH as well. Used it with my Fender 6x10 neo cab and an old custom Kroth 1x15 (a defunct Canadian cab brand) from the eighties with a JBL E140 in it. Both sound great.
This will be my head for smaller gigs and the backup for my Super Bassman 300. I only ever needed to use the TH once as a back up - because of a blown fuse - and it just didn't have the volume I need for bigger gigs without getting ugly. The Mesa won't be a problem there. The fact that it will run at 2 ohms also sealed the deal. I sometimes run my SB300 through two 4 ohm 4x10 cabs and that would have been impossible with the TH.
Lucky for me, the rarity of Aguilar stuff in Canada, coupled with the shitty exchange rate right now, meant I got almost what I paid for the Aguilar rig 4 years ago. (It also means I can't buy any of the cool stuff people have for sale in USD right now....
Ha.)