Zyrobs, how do you rate the r3 vs the 183?
Same value/dollar ratio on both, but since the P183 costs much more, it has a much higher value. In my opinion.
The R3 is like a normal average case, loaded with extras everywhere. That's what you should expect.
The P183 is like a tank, it's built to be a solid, isolated brick with no building flaws (my R3 has a bunch), but you can still easily access all your stuff.
I don't know how else to describe it. The air filters are way easier to clean (single removable door on the P183, versus disassembling the entire fan holder on the R3). 5.25 slots are easier to install with the rail design. The special side panels on the p183 provide better isolation (and are also more aesthetically pleasing - R3 is just a piece of steel with foam glued on it). And because of the dual chamber design, there is a smaller area for the main components - so there is less air to move to cool that space. That's probably why the R3 needs all fans installed on full go to match the cooling of other, performance orientated cases. Also, the chamber separator is also padded out with some soft material, to isolate the two chambers better, and to seal the whole case more tightly, and the separated compartments allow for VERY smart cable management. Give it some effort and you can get the insides look very clean and pretty.
In my respectably powerful machine, with 6-7 total fans (all speed controller), I get sufficiently low temperatures and only the HDDs make noise. I haven't tried moving the setup into the R3 to compare temps/noise, and I probably won't because I'm biased towards the P183. I just like the whole design better, internals and externals both. The R3 just... doesn't feel that special.
On that note the P183 doesn't have proper USB3 panels, or SSD holders. But you can use the floppy slot for either, tuck in a SSD there or a USB3 front panel (some motherboards even come with one). I have a bunch of cables tucked into that slow anyway, and they lock the SSD drive in place safely enough.
I can't say for sure how the R3 stacks versus the P280, but based on the pictures of the P280, I'd say the R3 would perform better, especially in contrast to the price. The power button placement looks especially dumb on the P280...