I've had the 3-channel combo version for years. Never liked anything except it's clean sound or the sound of a Line6 POD plugged into its fx return, but I think there's something seriously wrong with mine. (YMMV)
Absolute screamers, hot rodded Marshall to the 10th degree. Lot of tone options, I would have to think pretty hard about not buying it. Have you played it?
The VTM does not sound as good as the Ampeg, but is still a cool head. There is one at the rehearsal space. It was what the 5150 was based on. Lot of tonal options with the tiny switches.
I love those old Ampegs. There's some serious tone dripping out those. Thing is, there's so much added gain that you have to back off it some or it starts to get buzzy but otherwise a killer sounding amp.