I have a propellor I, the Propstick USB version. I work in cardiac electrophysiology and am no expert at microprocessors or electronics. It is nice, particularly the number of hubs but I keep coming back to Arduino. Nothing yet I've tried to program can't be done with a bit of thinking on a single core. I think the Propellor has a number of problems:
- The programming language, "spin", is rubbish compared to the C/C++ of Arduino. Yes, you can use assembly but it's a pain. Also, I believe using "spin" the individual hubs are actually slower than an Arduino.
- The IDE's not as good either. (and only runs on Windows).
- The programming library is not as helpful. Maybe it is there but it is not as well organised.
- the forum is not as good. It is not well laid out and here there are people who know there stuff who are generous with their time. It doesn't have the same community.