If you only shoot and are use to handing a client a tape then the HVX may not be for you. If you shoot and edit and want to quit wasting time digitizing tapes after the fact then the HVX is worth a look. If you know a shot is no good you can delete it on the spot. We did a shoot for a client who owns a Sony Z1U. They did some test shooting with the Z1U for use in a high-end property marketing video. They tried 60i, then they tried de-interlacing the 60i and were not happy with the way it looked on the 50" Plasma screen.
We shot for them with the HVX200, 1080 24p....delivered them a hard drive full of P2 cards....they are editing now and are very pleased with the results.
The client mentioned the fact - during the shoot in his words "I don't mind waiting a few minutes to transfer footage if it saves me the hours and drudgery of digitizing footage".

On the flip side, my son likes to watch the digitization process, so he can mentally categorize all of the available footage. It's like a pre-editing or spotting session for him. I've offered to digitize tapes while he's doing another task, and he's refused. Then again, he didn't complain about no digitization when we rented an HVX...

The bottom line is your workflow. Long form, unstructured documentaries are not ideal for P2 cards. Short, well planned, controlled clips are. And if you can work it so you can see a quick edit before tearing down a set, they can save yer butt. :)

16 GB cards is around the corner
http://dvinfo.net/conf/showthread.php?p=624820#post624820