Hello.
I'm a satisfied user of some A4Tech products. I had the KBS-20Mu, that was the best membrane I ever used. (I killed it by washing it and not waiting to complete dry and then dissassembled it for the volume knob; probably it would still work if I waited enough.)
This keyboard, like some of A4Tech, features the Natural A Shape ergonomic layout. It's basically and diagonal-oriented rows on the keys.
I used it pretty much time and I can tell you guys it was AWESOME. It's probably not like an ergodox, kinesis, etc (However I don't like the idea of the complete rearrangement) but it's pretty damn good!
I could feel my hands being so much better angled and my fingers doing less force to reach the keys. Sure, it required like 2-3 days of getting used to, but damn it was so good.
Im wondering why no brand did something like this on a mechanical keyboard? The keycaps are differently shaped and probably the switches would be differently placed.
Here is some images:
My beloved RIP keyboard:
~