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whats already been mentioned pretty much sums it up...
OAG Pro's
Less load on mount
Guiding at similar or better pixel resolution
Minimizes differential flexture
Con's
Can occasionally be difficult to get a star... I have never had to hunt around with the QHY5 + TMB/Lomo 80mm F/6. Not once. However it was sometimes tricky in the GSO 8" RC @ 1634mm FL.. The only thing required usually with the 8RC was longer guide exposures...
I have not used a guide scope in quite a while, and I don't see myself ever going back..
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