I've also been doing some testing on the Maemo version. From what top shows, while running, cuteradio tends to hover around 20% CPU, and pulseaudio stays between 20-25% CPU. I'm not seeing significant warming or battery drain here (although I haven't run for more than about half an hour at a time).

This is also on a wifi connection. My phone is sitting just a couple of feet from my wifi router though, so it might not need as much power...