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I guess if you are autoguiding as well, then the autoguider has less corrections to do, the mount should already be tracking solidly with the TDM and the corrections made very quickly so you end up with very smooth performance, no sudden movements should mean tighter images.
Or if using adaptive optics, then you are cleaning up the seeing, as any adjustments required would then easily be within the AO capability.
Just like the Ovision worm for G11 mounts, you want the base performance of the mount to be as smooth and error free as possible, the TDM might deliver this performance from cheaper mounts, saving you the hassle of selling and buying a more expensive mount. You can keep what you have already and improve on it.
I'd jump on it if it was a $500-$1000 add-on, at $2000+ it gets expensive.
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