Lookin at my 900, I'd say there are some things that I like about the Tempest compared to it. For one the 200mm fan on top is whirring aways nicely now, but when it inevitably packs in, it's gonna cost me around ~£15 to replace, and that's for another Antec BigBoy, whereas in the Tempest you could presumably use the fans of your choice on top. Also on some of the pics it looks like they have included dust filters on the front vents (although it might just be the noise dampening on the blanking plates for the top 5.25" bays). This is a feature which categorically needs to be implemented on the 900, as it sucks in dust like a hoover. (I heard the 900's bigger brother, the 1200 will have this feature.) However, I think the 900 wins out in terms of style. Tbh the whole case just looks a bit naff, especially the strakes, I really don't like em, and I prefer the Mesh+Perspex side panel on the 900 as it's something out of the norm. Plus as others have said the side panel somehow looks out of place, although it could just be the camera/drawing angle.