The latest Ashdown ABM 600 is a significant move forward when compared to the previous models. I'd definitely try a MK IV first before making a decision.
New band to me... Sounds Like Winter, from Oz.
I'm on my way through the latest album, it's cool.
https://sounds-like-winter.bandcamp.com/album/fight-the-stairs
We do a cover of For Her Light as a warm up at rehearsal... I can't take them seriously though. Proper comedy goth voice, they make me laugh whenever I hear them.
I had one, I didn't sound like a Trace Elliot and wasn't as loud as the numbers suggest but was perfect to use with a quality pre amp and was well built.
The nearest that I have tried was a GK Fusion 550. The big one not the Class D.
It reminded me of a Trace Elliot as soon as I started playing through it, I should really buy one instead of trying every other amp on the planet. Lol.
Are they any good for metal?... yes, that's all they are good for after watching those videos.
It's an interesting looking amp head, I look forward to watching a proper demo video.