From experience of both, I would definitely go for the sealed cartridge 7710.
i concur. fit and forget
But doesn't everyone like to spend a evening regreasing everything that moves on their bike every so often? I thought that was half the fun :-P
I think im gonna go for the 7700 that I have been offered, just to get the build rolling.
@Rodolfo started
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From experience of both, I would definitely go for the sealed cartridge 7710.