I have the AD100VT and I love it. But I can't say much, power wise, for the AD30VT.
"When ignorance reigns, life is lost."

Teh Space
for a hyrbrid, id go for higher wattage for more headroom. The 50 is definitly better than the 30, and the 100 even better.

Gibson Les Paul Studio w/dirtyfingers pickups
Gibson Joan Jett Melody Maker
VOX ac30 head
Marshall 1960 4x12 cab
Fender Hot Rod Deville
The 50 and 100 have better speakers (Celestion 70/80) instead of the Vox Designed the come in the smaller ones. They will sound better at higher volume also. If you plan on gigging, go for the 50 or 100 but otherwise the 30 will be fine.