"Mr. Hobby" is a product line within the GSI Creos company. They're a very reputable producer of hobby paint and tools in Japan. Maybe not as well known in the west, outside of the sci-fi modeling community (who know them as a result of Japan being a cultural center for mecha and sci-fi figure modeling). They've been around for decades, but have only recently started offering airbrushes.
I've no experience with them myself (their airbrushes, I mean; I've used their primers and some of their other tools), but from word of mouth in the community here, indicators seem to be that their airbrushes are manufactured for them by Iwata. Sort of like how SATA (and a few others') brushes are manufactured by Badger. Their designs appear to be directly based on Iwata brushes, but with some tweaks/improvements. Not copycats, but more like GSI is submitting changes to Iwata as part of their manufacturing specs.
Looking at pics of the parts, the 270/289 looks to be a hybrid: Eclipse/Revolution-style "guts", with a Micron-style (in terms of design; I can't speak to precision) head system. If that's anywhere close to true, and it is being made in the Iwata factory, then it should be an extremely good brush for the money.
I'd love to see how it sprays compared to the Eclipse. The design implies it might spray nicer fine lines at lower pressure (provided the general quality comparison the Iwata holds true), and the head being removable would make cleaning the tiny nozzle as easy as the Eclipse's large floating nozzle. The price is less, so if it sprays as well or better, it could be an Eclipse-killer when it comes to best all-'rounder.
I have 2 SOTARs, and while they're fine and capable brushes spray quality wise, IMO they're no longer market-competitive. It's a detail specialized brush rather than a general purpose brush, meaning you don't buy one as an "only" brush, but rather in addition to a general use or broad coverage brush. Problem there is that there's general use brushes that can approach or match its detail ability for not that much more money, so if your budget is tight enough to make its price a factor, then you're better off buying one of those better all-rounders than two separate brushes at a higher total cost.
It also has rough spots that make it IMO less desirable if you can afford just a little bit higher of a price. The cup interior has a very "no-frills" join with the body, which creates a bad recessed interior seam that paint can linger in. This is not a problem with the machining or soldering/brazing quality, but rather with the shape of the parts. I.E. the problem is in the blueprints, not in the manufacturing. Both my SOTARs have rough machining in the trigger cutout that give the trigger action a gritty feeling if the trigger is not pulled back in a specific way. Doubly annoying, as Badger touts applying a low-friction "Glydercoat" finish on their triggers, which if true is rendered a completely pointless waste of money by their leaving rough edges on the metal itself.
I've also had issues with SOTAR nozzles being either mislabeled or manufactured out-of-spec. I've got two "fine" nozzles, one of which sprays perfectly, the other clogs like mad and is excessively restrictive about paint reduction. Close examination reveals the latter has a smaller hole at the tip. So either the smaller one is out-of-spec, or the larger one was a mislabeled/mispackaged "medium" nozzle. I suspect the former, as the latter would be strange given how well/poorly they respectively work together with the "fine" needle.