Speck hard cases - or any hard case for that matter - will reduce the viewing angle of your display. Just something to keep in mind. I wish the display on the MBA would tilt back farther... Wouldn't like have a few degrees lost because of a case.
Hey - in what way? I've not noticed this - I have the Lime Green 15" Speck case (sell all of them), and all my co-workers have them ... the Speck case, specifically, doesn't hinder opening and closing the case. I suppose if you wanted to tilt the screen WAY back it could eventually interfere, but I'd be nervous pushing the screen back that far regardless.
Right now, my MBP is flat on the desk, and I've got the screen pushed pretty far back - I'd guess it's probably pointing away from me at a 45-50 degree angle.
Fred