I've played on the Behringer VTone head, but not the LX1200H. I thought is sounded pretty good, and durn near blasted me out of the amp room that I was playing in. Plenty loud for just about everyone.
As for "how to get more out of it," what do you mean? Is the amp too quiet? Are the presets flexible enough for you? Explain, please.
Guitars:
Fender 2006 MIM Fender Stratocaster HSS in 3TS
Ibanez RG 570 with a bridge Invader
ESP M II Deluxe with a Tune-o-Matic bridge
Eleanor, the magical, mystical Road Worn wonder Tele
Blackstar HT Club 40