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Hi Lewis,
I have a TSA120 currently mounted on an IEQ30 which is similar in size to a GPD2. The scope weighs about a kg or so more than your 102, and is about the same length, so I imagine my experience will be similar to yours.
My scope is acceptable, but not great on this mount. I fitted the mount to my CPC1100 tripod (since that scope is observatory mounted). On this tripod damping time is about a second and a half. Focusing at under 100x is easy, over this there is movement that makes focusing progressively more tedious as mags go up, though still doable at 300x.
I have yet to put my st8300c on the scope, but my impressions are that you will have to guide using an OAG, as a separate guidescope will be too much extra load.
I really believe this class of mount is excellent with shorter scopes like vc's, sct's small refractors etc. With that sort of scope my mount can take integrations of any length. Ideally I would want something bigger. Like you I advertised my mount for sale, but I only received ridiculous low ball offers.
If it had sold I would have unhesitatingly gone for a bigger mount. I have learned that longer scopes need bigger mounts.....
FWIW
cheers
Gary
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