The Reverbs are awesome wheels and the OTG spacers would make them look great on the xB. Personally, I'd stay away from camber shims/plates unless you're going for a "VIP" look but in the end, it's what makes the owner happy. Either way, I'd definitely pick up the OTG spacer shims to get those wheels close to flush.
ixnay on the ambercay IMOay
I only like the camber on the smaller wheels that actually have tires on them, examples of who's car's would/already do look sick with camber: Squirrel, OMC, Thundergod, the blue BBist one, etc
push those Reverbs out with the spacers! Then send me a set!