The Synguide (and Celestron Nexguide, same thing) do work and there are a few IIS members using them happily.
I have a similar device, the LVI smartguider, which isn't as sensitive as other guiders but with a fast guidscope isn't a big issue.
It does take a while to get these standalone guiders setup/calibrated but it doesn't take much longer than a QHY5 with PHD on a laptop, a setup that I also use so can compare.
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