Huh, Reza... normally you own all the amps I want, so weird to ever see the tables turned?? I actually had dreamed of a Matamp 1224 MK II for about 8 years or so after reading a stellar musicradar review about them maybe in 2008 or so, back when I lived in the US and the thought of buying a custom amp from the UK without a major US distributor was kind of a no-go. I moved to London a couple years ago and the first thing I did was custom ordered this with a 2x12 from Sam at Wire & Wood:
DSC_3116
DSC_3125
Sam's super good so highly recommend him if you decide to go this route.
Build quality on the head is really good. It's very old school construction and like they have a single guy that does all these front plate etchings and has been doing them for like 30+ years or something. So in the age of digital modeling (and I run an axe for most prog/metal tones), this really dedicated hand-wired type of build (it's turret board style) made by a couple of guys who have been doing this their whole lives was a major part of the appeal. And I'm a huge Boris fan so I thought this would get me into that zone.
As to the sound, the 1224 is probably not the most doom-specific Matamp but it is the most versatile. It has a voicing knob which both adds gain and seems to shift the mids lower and adds more bass, and this is foot switchable. When set to its angriest, it's definitely a Doom-y amp with a sort of thick, fizzy sound. I still find it sounds much better when boosted, so I always run it with a boost when I'm using gain. I feel like it could get a little bit meaner, but it's 90% there, much more than amps outside of this Matamp/Orange/Electric lineage. So that's one option. Other notable things are a midboost that puts it a bit into Marshall territory, though not anywhere near the amps you already have. Pretty good reverb. Really nice cleans. A couple other switches that make very marginal adjustments that are hard to verbalize.
My biggest complaint is more in terms of its conveniences. The loop is line level and needs one of those special Y cables and plugs in on the front...not a huge fan of that. The footswitch has a voice switch to move between the "nicest" voicing and whatever you have the voicing switch set to (so naturally I usually have that on its "meanest" setting), and an overdrive and reverb switch. But if I wanted to go from a great clean tone with reverb to a great lead tone with delay I would have to hit all 3 foot switches AND dial back the gain on the amp AND hit my lead effects AND probably adjust the volume as well. Even though I'm not using this amp out, I still find it annoying to change so many things to move between 2-3 basic tones, although those tones are really good.
Hope that helps. Of course the closest amp to Electric Amps would be something in the GT series -- an amp that doesn't attempt to be versatile at all, and so has a simpler interface with less to complain about.
