I have a 10 yo EM-200B, no refinements - runs like silk. Predecessor to the USD III mounts, from what I can gather.
It's a very solid, very accurate piece of kit, even without guiding - once you get the SH polar alignment sorted out; periodic error +/-5 arc seconds peak-to-peak at worse.
The tripod is 3x tree trunks, more like a surveyors. I've kicked it several times while imaging, and it didn't move. No need to level it for polar alignment with the Tak system. The only hassle is that the polar alignment reticule is designed for the NH - so must be read in reverse. You get used to it.
Dennis (member) has a spreadsheet for download for real time conversion.
Here is a link to a post that illustrates the
SH polar alignment issues. White digits are the SH equivalents, but that's fairly obvious
You won't be disappointed with the quality. But then the new G11's are reputed to be much improved without the usual modifications - or so I am told.
The only addition so far is an ADM dual dovetail.