I'm comparing ball heads, and there are a number of fans here of the Bogen 488 RC2 and RC4. Here and elsewhere, I also see high praise for the RRS BH-55. To configure an RRS BH-55 LR with the several plates I might need looks to be about $500 more than the RC4. Can anyone explain what I'd be getting with the BH-55 that might justify the additional cost? I'd be especially interested to hear from anyone who has seen them side by side. Thanks.

