Hi there Steve,
Similarly to Mark, I have just recently gone from using an ED80 as a guide scope to using the TS OAG9. To be absolutely honest, I wish I had done this sooner. Obviously no issue of flexure now (not that I seemed to have it using the ED80) but the biggest thing is that I have gone from a payload of around 14kg to around 10kg (and hence 3 counterweights to 2 on the EQ6).
To date, I have had absolutely no problem getting a guide star (ED120, QHY8L imaging CCD and a DMK21 as the guide camera).
Hope this helps.
Cheers,
Daniel
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