Just a few thoughts regarding the R5
I've had an R4 for 2 years now and building a new PC I decided to get an R5 (and keep the old running in the R4!)
I was drawn in by the upgrades with more modular innards, better fan filters, proper SSD mounts on the rear of the MB tray...
But then not all is perfect. Sure the new moduvents might look better but I find they arent as quiet as the original type...and the clips are easily broken, they never seem to sit right once they've been taken off
The new door, whilst people rejoice at the fact it's reversible, it feels flimsy compared to the door on the R4, not as substantial, feels like it could easily break.
Still with the front door, the latches are irritating in that when you close it you snap it shut at the top then the bottom, it doesnt just close neatly like a magnetic door would...which was pretty damn secure. They could have easily made the door reversible whilst keeping the very nice magnetic latch they had...and kept it sturdier.
The size panels...the right side (rear?) panel is a lot nicer to use with the way it closes and the captive nuts does make getting that side shut a lot easier.
But negatives are both panels feel flimsy compared to the R4, the R4 panels were thick, heavy and practically had no flex. They made you think this is a solid case.
The side panels on the R5 feel thinner, there's definite flex and wobble when you take them off and...they just generally dont feel as good.
Then there's the quick release latching system of the left side panel which is nice in theory but the part of the panel that the latches lock into seem to get bent easily and the panel...doesnt sit flush with the case unless you use screws...so a nice idea but flawed in practise, having a captive nut panel like the other side would have done the job just as well.
On the plus side(s), the fan control switch is a lot nicer, the I/O layout at the top just seems...better (even with the power button feeling catchy).
The front accessible bottom fan filter is very nice to have rather than dragging the case out to get to it, the modularity of the case is very nice to have.
...on the whole though i think the R4 is made better (more solidly?) and I think (in my own opinion!) it's the better case...even with the R5's enhancements