Yep, that is the one I got, they had a sale on it for 15% off awhile back so I got 2 of them. Although I really want to get my hands on the F13, it looks like an updated version of the MT-12. It might have fixed the threads (way too small of threads and too many and not even remotely square) and possibly the shelf is thicker.
Yes, the Eagle Eye X7. I thought about getting one but it is just too dang ugly and I had to pass in hopes that someone releases a similar model that looks better. Like that X6/X7 combo render someone made.
Yeah, the tint could be separated into 3 areas like you mentioned although the deeper C8 style reflector could be making it more distinct then it is in this light as the reflector is not all that deep. I plan to build a C8 with a 5000k as well to compare so that will be an interesting datapoint.
Overall the LED is good if you want output IMO but it is not a tint queen by any means. But then I have 2 basic modes, max output or high CRI tint. For the first the XP-L2 is proving to be a good option since it is 3V and easy to use in most lights. For the latter, one word. Nichia.