Hey DSL40W is all tube. Thats way better thant this, and priecey also. At first I wanted to buy the DSL401 instead of this but i needed something more practical. DSL401 has 8 tubes and i wan`t shure how they handle when carried around a lot. Also the cost of maintaining is bigger because the tubes are getting more expensive every day.
A have found a cheap deacent marshall cabs with 2x12 and 4x12 celestions for a price aroun 250$-400$. I`m shure on Ebay they are cheap. THey can be used with this amp, but it doesen`t get any louder. It just gets that tight low-end atack and that`s important for me when gigging. I`ve played a number of times with VS2000 amp on stages with up to 500-600 people but with good PA systems. For small gigs it is just enough if a club has a deacent soundsystem. For bigger stages (above ~1000 people) i agree there is a need for an all-tube amp with minimum 2x12" (assumin that the PA system is great off course).
AMong others, I know the case when the bluesguy that recorded my album played with his Marshall Studio 15W tube amp on a stage in front of a more than 5000 people. It`s just a matter of monitoring and PA system on that scale. Also many metal guitarist carry around their 10" speaker amps to get that metalic sound of it for their leads. They just put a mic in front of it and thats that.
EDIT:
Now I've had request to include some sample audio for this baby and here it is. Although you must take this recordings with some strong reserve - the audio is not so good in quality, and this is mainly because there is no cabinet. ALmost all of the sound of this great amp comes from its cleverly designed closed back speaker cab.
I've recorded some presets using Emulated DI Out on the amp itself, and this can be also a good example how his DI actually works (not the best..).
So you can make some rough opinions about its sound but don't take it for granted, the real sound is always in the speakers