I have the 690, and am fairly disappointed with some aspects:
1. It's massive - if you wish to stick a whole lot of hardware inside the case, then that's fine, but otherwise there's really no point in a case this large.
2. It's loud - or at least not quiet. The mesh panels on the top and front, while good for circulation, also do nothing to muffle the sound of the fans. I also chose a Palit graphics card which turned out to have a fairly loud fan, and the case does little to reduce the sound.
3. The On/Off / Reset buttons - these spring loaded buttons require a lot of force to press. This is good if you don't want them pressed by mistake, but I have my computer on a small trolley, and I find I have to stop it from moving whenever I press either of the buttons.
4. Cable routing - I have a Corsair VX450 power supply, and the cables, which are routed between the rear of the motherboard panel and the black outer panel on the right side do not allow for the black outer panel to be closed properly. You have to press hard, and the panel is still warped by the cables. I'm not an expert on cable routing, but this is how I got it from the PC shop to begin with, and I couldn't see any better way of routing. There's also the general feel of the panels (left and right) - they just don't have a quality feel to them. The left side panel sits well in the end, but there's no real rail to help it slide into place. Placing the right side panel required bending the small tabs ,which hold it in place, with a screwdriver.
That said, much of the disappointment is my fault, as I told the PC shop I wanted a well ventilated case, but did not stress that I also wanted it to be silent.
The case itself also comes with two 120mm fans @21dB each (front and back), and has room for lots more fans (one 120 bottom, two 120/140mm top, two 120/140mm left side), so it's probably possible to get super silent fans and quiet it all down. This, of course, will only be possible if you pick your CPU cooler and GPU cooler accordingly!
I also find the ports on the top of the case pretty handy (headphone, mic, 2xUSB). There is also one firewire port and one eSATA port on top, but I haven't used them, personally.
I hope this was helpful.