I have the SA SRf-5 hub on my bike. Similar to the one you are using. It's ok. I find myself futzing with it on occasion more than I would like. The shifting doesn't always seem to be the smoothest. Lately on mornings where the temps have been below freezing my cable has froze up and jammed. I think due to a combination of running a nearly full cable housing the whole length and a slight U shaped bend under the BB shell. Recently I removed the cable and blew the housing out with compressed air and lubed it well. I haven't had a chance to try it out yet though.

What size chainring and cog are you planning to use?