Well...I'm disappointed (but very appreciative of the post for the info!)
The 1200 is just too over the top. I'll bet it's loud. Gotta be with all the whooshing noise from all the fans. I'm not crazy about the helicopter (ROFLCOPTER?) blade fan on the top. I mean 200mm? Where are you gonna find a replacement if it's too loud? Plus, without a fine-mesh "spoiler" like the P18x series has, anything you drop on the case is going to go straight inside. Chips, crumbs, SCREWS(!), etc.
The 300 is MUCH more my style. I can see putting two, 5-drive hotswap cages in there for a 10-drive workstation. The biggest problem is the lack of any cable management. They couldn't make the case just "this much bigger" and add a raised mobo tray w/cutouts ala the P182?

That case will be a mess inside even w/a modest system, let alone a 10-drive system. And I didn't notice any filters on the 300. Does it have filters?
Someday, they will make a big, tall, open case like the Stacker, with NO windows or side panel vents. It will have at least 6, open 5.25" drive bays. It will have cable management holes inside. It will have only 120mm fans in the traditional front to back configuration. It will have filters. It will be black. The closest thing to a perfect case i've found is
the LianLi A70B. It's almost perfect...except for the HD mounting and lack of cable management..but the thing is so big I don't think the cable mess would matter much. If it had all 5.25" bays in front and they were all covered by filters, I'd get it.