Just upgraded to the Enthoo Pro M, never posted my original build here.
Construction is mostly very solid which deals great with vibration noise.
It's nice to finally have my fans attached to my case, instead of ghetto suspended with elastic like I had to with the Arc Midi R2 because of its trash plastic front panel.
My only complaint is unfiltered slots on the sides and bottom of the front panel, but I dealt with this with black electrical tape on the inside which isn't even noticeable. That's just a design oversight.
I like the window too because it doesn't show off the empty space from my GPU to my front fans, it just shows off the motherboard and PSU area which is great because it's where everything is.
It all came down to the Enthoo Pro M and Define R5. I just couldn't go with Fractal Design again after all the quality issues my Arc Midi R2 had.
I have a really hard time enjoying things if they have persistent flaws, and at this point I struggle to find much of anything I dislike about my setup... finally! 
The full list of my equipment is below in my sig