Do you think the tracking accuracy and other characteristics of this
mount are appropriate (with Gemini system)? Any experience in this

My experience is with the Meade 12" SCT (fl=3M) and without the Gemini system.
As I understand it The Gemini system improves performance by about 50%. My
experience is with film cameras where exposures are rather long, i.e. upto 1
hr., with guiding, though most recently with a CCD camera and exposures of
around 30 sec. In addition the performance depends on focal length. At 3M,
less than half of the CCD exposures at 60sc are unsuitable. With a f/6.3 and
f/3.3 reducer almost all exposures are suitable. For planatary work where I
use a 3.5 zoom, exposures of 1 sec. are fine.
The problem is periodic error of the mount. PE in my mount is not exactly
a sine/cosine wave but seems to spike around 30-60 sec every 4 min. In a
series of exposures you will catch these spikes as well as the lul points so
you pick and choose.
There is a Losmandy Discussion group and they disscuss ways of minimizing
PE, I have tried every one of the suggestion.
If you dont like these inconviences then be prepared to spend $5k to $10K.
I don't believe that there is a better mount for the price.
Hope this helps.