I have used a Vox VT30 for as long as they've been around and the first thing I did with it was change the speaker for a quality one - Eminence Ragin Cajun in my case. It made a world of difference and I eventually sold my Vox Heritage AC15 as it was redundant because of the VT30.
I always use it for band rehearsals as it is close enough sound-wise for either the early Shads stuff or by switching channels, the 'Flingel Bunt' era Shads stuff which makes it a cheap versatile option , though as Terry says it isn't an AC30. The difference is not really noticeable at rehearsal levels, but becomes obvious when cranked up to gigging level.
Add to that it's capability of reproducing good Fender, Marshall & Boogie tones which makes it a keeper for me. I emphasise that the quality speaker is the key here.
I have posted demos here of various echo machines and this amp was used on some of them and well accepted by those who listened.
