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At least for the CEM120EC2, the relative encoders and remoteness are not a problem as you can always "seek the zero position".
I also get good guiding results (using PHD2) and my results are essentially bound by the seeing in the area. I remember doing some unguided tests a while back (at 700mm) and I think I got up to 10 min ok.
To explain further on what I was talking about re: firmware/software. The CEM120 models have details for a pointing model, but it's never been implemented. There are bugs related to guiding at fast rates (from memory < 2s) - I generally use 5 sec so I'm not too impacted, but it would be nice to calibrate PHD at a faster rate. GPS issues - I'm not sure if this is software/hardware at root fault, but software should be better to handle failures (it sometimes fails to lock on to satellites for a fix and I assure you I don't move my dome that contains the mount).
These issues (and more) have been reported to iOptron but we've seen no updates for over a year now.
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