I think they're nice and inexpensive. There are 3 exposed 5.25" bays, 1 exposed 3.5" bay, and 2 (may be 3 if you squeeze things) internal 3.5" bays. The switch/LED configuration is sort of strange- the two red reset switches are labelled 'system 1' and 'system 2', and the LEDs are labelled 'power', 'HDD 1' and 'HDD 2'. (None of the above is very clear from Skyhawk's website or drawings). Skyhawk also makes this model in aluminum at extra cost, which may dissipate heat better. Check pricewatch.com for prices and vendors.
I do not recommend a fanless power supply, but something like an Antec Truepower is fine. The 12cm fan behind the left front panel is fairly noisy, but you may not need to plug it in if your system runs cool enough. If you do need it, replace it with a 11 dB silenx fan. The internal 80cm fans are quiet enough as is. I'd also recommend a pair of rack rails and bracket set so you can slide the case in and out of your rack, in which case you'll need 1 each of these:
I'm currently using three antec 4u22atx cases.
They are quite cheap for rack cases although nowhere near as quiet as the Sonata that I had, so I did find myself spending a bit more on better/quieter cooling for the CPU, a fan or two etc.
SO I replaced the 12cm fan at the front, and also the 2 at the back, put a zalman cnps 7000b on the cpu's and am now looking for hard drive cooling.silencing solutions. This is because I am rentind and cannot get air conditioning here. Otherwise they'd be fine without most of those fans I suppose.