Graynomad:
I've been using it for a few hours, still can't get a download but we're (Alex and I) hopefully working that out.I quite like it, the tool bar is a little 1990s (but then so is the official IDE) I feel but overall so far so good.
I like it too, it's exactly what I need. AVR studio is a bit too much, and Arduino IDE lacks several features.
However, like Rob, I can't upload to the arduino. Compilation works.