The PS-290 looks like a clone of the Iwata HP-TH (by which I don't mean inferior, just a direct descendant with minor variation). From my experience with the HP-TH, I'd add a couple caveats to the above recommendations:
1) The fan tip produces a lot of fogging, so you need much better ventilation with it than with a normal airbrush.
2) The wide flat front of the round tip means it's difficult to impossible to comfortably do lines smaller than around 2mm. You can't get the needle tip close enough to the substrate without occluding your view or restricting airflow.
It does, however, have excellent atomization, and is surprisingly easy to clean.
IMO it's a brush who's utility leans towards broad coverage and large-scale projects where you don't care as much about up-close detail. It's closer to being a mini-HVLP than a typical airbrush. I'd wager it maybe sprays better than the Grex (based on Grex's reputation: I have no personal experience with Grex brushes), but it won't have the versatility allowed by Grex's tip system.
It also has higher air volume requirements than ordinary airbrushes, so it doesn't work as well with light tankless compressors.
People I'd recommend it to:
-RC modelers, gaming terrain modelers, and other modelers who work in large scales and primarily use masking or templates instead of freehand.
-Mural or automotive painters who want something higher volume than a regular airbrush, but defter than an HVLP.
-Cosplayers, and full-size creature suit or puppet FX painters.
People I wouldn't recommend it to:
-Vehicle modelers who work in scales below 1:35, figure modelers who work in scales below 1:8, or gaming mini painters.
-Fishing lure painters.
-Fine art painters or illustrators.
-Face makeup artists, FX painting meant to be seen close-up, or other face painting.
If you're in the latter category,
the PS-275 is IMO better suited. It only comes in .3 option, but that's a good "jack of all trades" size. A Grex Tritium will give you all the tip/needle options, but TBH you'll probably find the larger sizes and fan cap options collecting dust, so it may not be worth the extra money.
Your reference to zenithal highlighting suggests you're a gaming mini painter. I wouldn't recommend a fan tip for gaming minis (or similar models), as fan tips are better suited to flat topologies rather than the complex topology of minis. Unless you're painting on the sprue, but that would preclude zenithal painting. Even if you're batch painting, a fan tip is IMO the wrong tool for this sort of surface. It won't get in the nooks and crannies as well as a round tip will, but it also won't create the "light cone" dynamics you'd want for zenithal either. A fan tip would mostly come in handy with painting vehicles and terrain. And if you're working inside a residential space (as opposed to a shed or garage) with a common desktop hobby spray booth for ventilation, the added fogging will be a big issue.
For reference: I'm a modeler who mostly works in smaller scales, with past interests in creature effects.
Hope this helps.
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