I just got a 750D, and i allready got a few gripes with it. some fo wich i was allready aware off, and maybe some not.
The front intake is narrow, its clearly designed for 120mm fans, if you stick in 140mm fans, the case panels are covering some of the fans airflow, wich i dont like. Corsair is also kinda forcing you to use there screws for front fan mounting. because there are no standard fan screw holes with wich you can also use rubber grommets for mounting fans. instead there is a narrower hole with thread in it.
I also dont like the fact that theres fan positions on the front bottom, wich are unfiltered, they are actually under the drive cages. Its goign to be kinda hard to keep positive pressure in the case, also because of narrowed intake. So these bottom meshes are going to suck up dust, since my pc sits on the floor..