I've got one, and it shaves really well; as well as my Natural Angle and other Gem razors.
The fit and finish are, to my mind, perfect, and the design is fiendishly clever. From what I can make of them, the other forthcoming razors make some use of either the blade side notches and/or central slot, and have 2-piece heads, but this doesn't. It uses the machined-slot-in-solid-head design that features in the Rocnel SE-P, and, again, the tolerances are incredibly precise.
The handle is quite short, but a quick look at my other Gem-type vintages tells me that this, and they, are about the same length overall. It is, of course, possible to use a 3rd party handle if so desired. Although this, being stainless, is heavier, it feels a handier razor because of the "minimalist" design and absence of hinged doors etc. Its looks might not appeal to some (many?), and my first impression "out of the box" was not one of beauty. Indeed, like the other Rocnel razors, it has a faintly "industrial" look to it, but, for me, that translates to solid, efficient razors.
My only slight gripe is that the blade I loaded from my existing Personna box of 100 (where each blade has a paper band around it) was nowhere as slack to load as that in the Rocnel video. I see from some comments in the pass-around for this razor that the blade has to be introduced into one side of the head rather than the other, but, even so, it was a fairly tight fit. To be honest, it wasn't much more demanding than getting a blade into a PAL type injector, and is a darn sight easier than the Rocnel SE-P with a halved DE blade. I think that this must be due to variations in the blade manufacturing tolerances, especially the spine, but it's no big deal for me. I did find with the AC Rocnel SE-50 that the sliding top cap, which is also secured with an M5 grubscrew, benefited from having the grubscrew slightly tweaked up with an Allen key to ensure a rock-solid fastening, but I don't think this will usually need any more than hand-tightening.
There's some question about how to clean the minute blade slot, but I would think that pushing a blade through so that it just peeks out the other side would eject any build-up.
I plan to use it over the next few days, but I'm really impressed with the sole shave I've had with it so far. It certainly isn't cheap, but I had been planning to buy a Bullgoose Asylum RX, until logic told me that I have quite enough AC razors for the moment, and the fund went to this instead.
It's certainly a "Marmite" razor, and people coming to it without previous Gem-type experience might find it quite a learning curve. However, once you get the "face-flat" angle right, and bearing in mind the considerable increase in weight over the vintage models, it is a really close shaver.