I agree with you monkeyhanger, they should just make people aware that there could be reception issues, and let the consumer decide. But hey ho...
Regarding the performance of the screen, even heavy frost and ice doesn't just magically disappear with the Ford Quickclear, and sometimes needs a bit of assistance. Given that the sides need scraping anyway, it's not the be-all and end-all of solutions, but second to frost is misting and condensation on the inside when it's really wet or cold. Besides, most modern cars will clear ice with the air-con and heating left on full for long enough anyway, this just accelerates that process.