I bought this as a Christmas present to myself and boy was I amazed! It has 11 bays for cd/dvd drives, it looks really good and is very strong.
All of the front bay covers have a thin foam insert to trap dust pulled into the case by the supplied fans. These are very easy to clean. The fans supplied with the case are ample for three-four hard drives and maybe a seldom used cd drive. Anything more and you'd want to replace the provided 120mm fans with maybe a Zalman or Arctic Cooling variant.
There is a lot of space inside for even the largest motherboards, this case supports mATX through to normal ATX sizes.
It is easy to fit cd/dvd drives with the supplied plastic rails, and it is very easy to take them out.
Overalll this is a very good case and I wouldn't change it for the world, well maybe a nice Lian Li one.
I purchased the CM Stacker as I required a large number of HDDs in one System. With 11 5.25" bays, and using 3 of CoolerMaster's 4in3 devices (which allow 4 3.5" drives to be installed in 3 5.25" bays), I can fit my 9 Hard Drives, a Floppy and a DVD Writer, and the intereior still looks pretty spacious.
The stacker also has an interesting front bay-cover system, with removable foam filters for easy cleaning, and a host of exhaust fans at the rear, side, and top, which combined, delivers excellent air flow, even without the optional cross-flow fan.
My only real wish is for a few more expansion bays, as my 'board has additional ports on backplates, but I have nowhere to put them, as I have all my PCI slots in use.