The Vixi HV30 is very good!!
We purchased the HV40, basically the same camera for our first HD project last October 2009. It could not have worked better. I read a review in HDVideo Pro. It was highly recommended as a second camera to shot along side of Pro Camcorders. That tell you allot about the quality of the image. For the price you can not beat it, BH photo has it on sale for $649, that is a steal for what you are going to get out of that camera.
I edit in Final Cut Pro 7, so it really does a nice job.
So to answer you question, no problem with moving from DV tape to HD tape.
Enjoy.
Rick