I bought an Air 540 a while ago, and I was quite disappointed with it. Honestly, I've been quite disappointed with Corsair's case offerings for quite a while now. The only thing I still use from them is their keyboards and fans -- mostly because I'm too cheap to pay the "Noctua tax". I can't tell you how mad I was when I got my Corsair Obsidian 900D (a $350 case) and found some of the drive rails were rusted. They technically work fine, but such a blemish on a premium product... unacceptable.
Anyway, about the Air 540, I can't remember every complaint that I had with it, but I do remember a couple. I used both 3.5" mounts that are in the front, and I noticed one problem rather quickly... the mount near the back ran significantly hotter than the one in the front. If I had to guess, this was mostly caused by being directly below the video card and further from the intake fans. I'm pretty wary about letting my mechanical drive temperatures get too hot, so I was definitely not a fan of that.
Also, I really don't care for latching 2.5" drive mechanisms, which the case uses. The problem is that 2.5" drives have varying thicknesses. So, if your drive isn't the greatest thickness supported (I'm assuming the 15mm size?), then it can flop around a bit. While it won't hurt a SSD (I still don't like it), it isn't good for a mechanical drive. In other words, it's a nice idea that just doesn't pan out well.
I think I also recall some weird problems with the PSU and cabling, but I can't really remember. The last case that I bought that I was satisfied with was the Fractal Design R5. My only complaint about that case is that the rear SSD mounts just don't work for beans. I tried putting a Samsung EVO 840 in there, and it simply didn't fit. I wasn't as worried about it because trying to keep cable runs down to a minimum would've been harder with a single drive way over there.