I'm currently stuck between 2 MFX, the zoom g9.2tt and the boss gt8. As I noticed the g9.2tt has tubes in it's pre-amp, I got curious of what would happen to my clean guitar sound if I plugged everything this way:

Guitar -> zoom -> my mg100 poweramp (fx return)

As you can see I'm skipping the solid state pre-amp.

Another really cool thing I like is that it has a usb interface. But I'm still considering between these two MFX...
Edwards LP 92CD
Marshall MG100dfx