Thanks to the link posted a few messages above, I ordered a Givi for my 400 last night. This is the best price I've ever seen, and I've been tracking it for six months. Thanks! I've waited for Clearview long enough. Who knows how much longer it will be, if they have developmental problems?
I've found different claimed measurements for the Givi; based on some experiments with a friend holding a yardstick I may or may not have to cut it down in order to see over it depending on which measurements are correct. (I am 5' 10" tall, and have a Corbin seat.) First, however, I'm going to try and use Rain-X on it. Yes, I'm well aware that eventually Rain-X will ruin my windshield. The key word here, however, is _eventually_. At $120 a pop, I can afford to buy a new one every couple years; indeed, I suspect it will be easier and cheaper than paying someone to cut it down. (I'm much too klutzy to do that myself and have it come out at all decent.)
My only big fear is that the lamnar-flow effect might make Rain-X useless. Now _that_ would suck! But the only way to know is to try, I suppose...