Consumer Reports tests consumer camcorders every year. They accept no advertising, making them more unbiased than typical DV type magazine reviews.
I checked their ratings on the HV30 and HF10 (done last year). Only two HD camcorders had a picture quality judged as "excellent"- the HV30 and Sony HD-SR12. The HF10 was very good, but not as good as the HV30. Also, image stabilization in the HV30 was much better than the HF10.
I also read this. The trade-off is in motor noise (HV30) if you happen to be using the on-board mic.