I've had my R09 for nearly a year now, and I love it. The only problems I've had are due to my own cack-handed-ness. For example, my tendency to take the damn thing out of my pocket every 5 minutes has been known to result in flicking the lowcut filter on. That's a pain - although I guess it would be pretty easy to fix, now that I think about it.
Nice piece of kit - I've been considering buying another.