I've had a few of the Marshall solid state amps over the years, still have two of them. Marshall has done a real good job of developing solid state amps that sound pretty greasy and believable. I've got an 80 watt Valvestate I bought new around 94-95 IIRC. It was originally a 1x12 combo but I took the chassis out of the box a while back and built a head cabinet for it. I made the 1x12 box it was in into an extension cab. That way I can use the head with either the 1x12 or also a 4x10 mid-80s Marshall cab I have.
The other solid state Marshall I have is a little Lead 12 practice amp. It's 12 watts with one 10" celestion speaker and it sound killer. In fact, it's the same amp Billy Gibbons used to record the guitar on ZZ Top's "My Head's In Mississippi" 
I also have a Marshall Artist 3203 30 watt Head. It has a solid state preamp with 2 EL34 tubes in the power section. It's outrageously loud for 30 watts! 
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