I too have a Celestron NexGuide. It is apparently identical to the SynGuide.
I have used mine with 100% success so far. Beats having a laptop. However, you do need to get used to the monochrome LCD and get your guide star roughly centred and focused before slipping in the guider.
I honestly can not complain about it.
Remember it can't stop field rotation due to your polar alignment not perfect.
I'm happy with mine but I have not tried to stretch its capabilities yet.
Darrin...
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