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I purchased a used EM200 about 5 years ago and have to admit that I am less than happy with it. I'm not sure of its history but it doesn't guide anywhere near as well as I had hoped. I may just have a bad one.
It has taken me quite a while to identify the issues. Initially the RA worm gear was too tight in spots, and would sieze especially in sub-zero weather and I had to re-adjust.
More recently I have discovered that the Dec motor has a huge amount of backlash. Not the worm gear, but the motor gear chain. At guiding rate, it takes about 5 seconds to change Dec to the reverse direction. Looking into this, I have learnt that it is not uncommon for the Taks as they have plastic gears which tend to wear. I am looking at replacing both motors to see if this will bring about sifgnificant improvement. But, even when replaced, I'm not sure what life to expect from them before wear becomes an issue again.
Not sure about the G11s- whether they have similar problems, but I would steer away from the Tak.
Cheers
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