I've used them at a local church recently and was mostly impressed. I'd recommend against the included lav, though. I had a lot of trouble picking up extraneous sounds that I didn't have with the Shures or Senns. Using a different lav than the one included was much better, but they were already spoken for in the service. After trying multiple locations and every EQ trick I could think of, I could only get the noise out by making the speaker sound bad. The handheld is excellent and the headworn is really good. I would also recommend placing the receivers near the stage instead of by the mixer. We had a lot of problem with interference. It could have just been that church's location, but the Senns didn't have the same problem. Moving the receivers behind the stage cleared all of the interference.
Also, look at the WMS450, if you can. Clarity on that receiver is quite a bit better, in my opinion.
-mS