As far as dimensions go it is big, no doubt about it. But it's not even an inch difference when compared to the Tempest, .9 of an inch actually. As far as CFM, mine is about equal so long as you install the optional fan on the left side of the case. It's not perfect but for me I have 316 CFM In and 292 CFM Out. If I were to get a slightly lower rated CFM fan for the left side it would even out actually, but the one I use I already owned so I didn't have to buy an other. I'm no thermo-dynamics expert or anything but 24 CFM seems trivial. As far as your swapping issue, that was never a problem for me, but thats because I rarely swap things in and out of my case, but I do clean the filters regularly so I'm very aware of the 40 thumb screws I have to go through to get to them. That aside I'm happy with the case, and the Tempest looks like a nice case as well that I wouldn't mind trying, but have no need to since the 1200 performance sufficiently.