I got the bumper at the same time. Perfect fit. Black on Black, looks good and it's just enough to raise the back off the table.
usual story with the cases though in that it gathers dust etc around the edge of the screen where it joins. (if that makes sense).
Good quality, does it's job but maybe a bit over priced tbh.
For some reason it does seem to fix the signal issue but I though that was something to do with iOS4 and not the actual phone as it's been happening on the 3G and 3GS since the update.