Hello,
I've just started to use my Sony Ericsson Xperia X8 android phone connected with my Garmin Ant+ HR, Cadence and speed sensors for my bike training.
And yes it works great.
I can read them with the Ant+ Demo apps and much useful, Endomondo, the android sport application, can read theme also and record the ant+ data together with the GPS and other data.
Instal ANT+ Radio service was a bit tricky, as Android Market was finding my phone as not compatible, so I had to use Android Injector, and get the .apk file from thisisant to instal ANt+ radio service.
Now it works and this is great !
Regards