Dimehead:
1. It can load 2 x NAM models in series eg. drive or fuzz > amp
Good... Point for them. Not important to be, though.
. 500ma
Great (didn't know that).
For me, it's not needed at all.
4. Run dual simultaneous outputs (xlr DI Out with cab on + a line out that can be tapped before the cab section, after, or from anywhere in the chain eg. just a drive, or whatever you like).
I expect the NC to do that.
NC has tuner too.
6. Load any Reverb Impulse of upto 60 seconds in length - this is massively useful.
Good... But honestly, I'm not in that IR reverbs (for me it's just hype, maybe I'm wrong). For you is massively useful, for me is not.
7. Has a multi mode display, including a live mode that shows a big preset name.
Well, display thing is a classic debate. In this kind of pedal, I don't find it too necessary. Besides, Dimehead display is just horrible for on board tweaking (based on Leo Gibson review I wouldnt see a single letter). For me, curiously, the display is a con in the Dimehead.
8. (probably) better latency
Yeah, I'm sure it is. Nevertheless, I expect NC latency to be good enough. Not a deal breaker.
9. Similarly, great updates, and more expected.
I seriously doubt that both effects quality and updates could be on par to the ones of a stronger company. But that's still too be seen.
10. Massive community online
Yeah, massive captures with gain all over the place. Don't even bothered to enter there myself, and I'm a NAM user. Massive loss of time, I'd say. For me, THIS is the deal breaker.
11. Cross platform (models can be loaded in a pedal, a daw, a mobile phone, whatever...)
Yeah, same as above... It means little if I can't trust models gain.
12. NAM Training is arguably better, and more flexible.
Again. Won't repeat myself. NAM captures are great. I enjoy them A LOT. My own ones, though. They also take much more time.
At the end, basically I don't think a NAM player is an option unless you only need your own captures. I'm not against Dimehead, I just find other options as more simple and reliable in different ways.