If you don't like gushing, best stop reading now.
I like Martin's amps a lot. The quality of the craftsmanship, the attention to detail and the ability for him to customise them to your needs are just a few reasons why.
My first amp from the MJW stable came from a very specific need. A very low wattage amp used only indoors for testing pedals. So essentially an amp I could crank without going deaf in a very small room. That amp was a Goldstar 6V6. Coming in at 5 watts you could dime it and still be heard over the top of it. You'd be shouting a little, but you'd be heard.
Sonically I'd wanted that one to stay more on the clean side of things so it didn't really break up unless you gave it a lot of push and turned everything up to 10. But again that's how I wanted it and it served me well for a long long time.
I also got to compare it directly to a 10 watt EL34 version which adds a very 'Marshally' crunch to proceedings and a little more oomph. Ideal for getting that crunchy tone at sensible home volumes.
The only reason the Goldstar inevitably got sold was because I got a cracking deal on a Roadstar 18. What I consider to be one of the best all round amps I've ever heard. At it's heart there's the much used Dominator, but this one had all the toys; active loop, power scaling and boost. With the gain, boost and power scaling it had what I can only describe as gain shaping. As you can move the distortion around the circuit essentially, it can do everything from clean to cranked Marshall to even full on stoner (which was a surprise!) with a little bit of a push! It takes a while to get your head around, but it's all there. For an amp with a simple tone control, there's a lot of versatility on offer here.
The Roadstar only left due to space constraints, and Martin built me a Bantam which is essentially a stripped down Roadstar. Which I still have and have no intention of parting with.
Covering the Fender side of things is the Twang King ( the name is my fault ). It's a Princeton Reverb clone in a head cab with a matching 2x10 cab with alnico speakers. We've compared this directly to a Fender and I can only describe it as a Princeton Plus. It's the same tone, but with more size, tightness and oomph. It's actually shocking how much bigger it sounds and how hard it hits for a little amp. I can't remember who was around last and tried it and kept disbelievingly repeating 'a Princeton shouldn't be able to do that!'. It does, and I'll never sell it.