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Arthur,
they're all slow considering that they use serial communication over Bluetooth. I am using another bluetooth adapter and I was told that it will only communicate with a mount at 9600bps. And it's true. It did not work at higher speed at all.
However I wouldn't worry about slow speed. 9600bps is more than enough for telescope control.
$109 is a good price if you need this adapter for telescope control only. I guess it's rechargeable, right?
I bought my from aircable.net for $120 but my is programmable and it can be used with any application replacing serial cable with bluetooth while the one from Starry Night may work only with telescopes.
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