Re: Vox VR30 vs Marshall MG30DFX
MG's are not horrible. They are good amps at a good price. Of course, it is your typical solid state sound. Thin, a little fizzy, and whatnot. However, with some tweaking on both your amp and guitar controls, you can find some inspiration in these circuits.
With my MG100DFX I use in my bedroom, I have OD2 clicked in with the gain set around 10:30 and a SD-1 in the chain. Rolling off the guitar's volume and tone controls gently allows me to get some pretty creamy tones.
It's all in your patience and knowledge of how to work with an amp. I still don't consider it great by any means, but no one looking for a good practice amp should overlook the MG Series.
EDIT: The on-board effects and reverb are also pretty damn good!