Hi Brett,
I hoped too, that someone would have experience with these and share them here....I've also just ordered one from Starlight Instruments to use on my NP101is.
Infos here:
http://starlightinstruments.com/stor...product_id=305
I went for the HSM20, to be able to manually override when used for visual observing.
Clear skies!
Cheers,
Christoph