I can't speak for the amp itself, but I can say that a 100 watt tube amp is going to be incredibly loud. Orders of magnitude louder than that hybrid Vox of yours. Even through 2 12" speakers instead of a 4x12 cab, a 100W tube power section is a powerful beast.
The trouble with high-wattage combos is that they tend to rattle and shake themselves to pieces over time. Having everything all contained in the same chassis, being played at high volume over the years through a couple of 12" speakers is kind of a recipe for malfunction. That being said, I've been playing through an 80W 2x12 tube combo for over 10 years and it's still kicking. It's always had its share of rattles and knocks but I love the thing. Heavy sonofabitch tho.
Before you pull the trigger on that amp, see if you can try it out in person. Crank up the master volume and batton down the hatches because it's going to blow your hair back. Then see if you can try a few lower wattage combos, like 18W - 30W and see if they can give you enough clean headroom for your needs. If not, go for the 50W or 100W monster. But otherwise you can crank a lower wattage tube amp and get that awesome saturated power tube distortion without blowing the windows out of the place.
