They’re not using HDV. The HVX200 uses DVCPROHD. Also, it only records DV on tape. DVCPRO50 and DVCPROHD are recoreded on P2 cards or a hard drive via FS-100 or similar device so you couldn’t record back to tape on the camera.
I’ve got two of them and they work just fine. I use one as a mixer in a robotic multi-camera production system and the other as a splitter/DA in an edit/dubbing/transcoding suite. (I also look forward to the free drink.)
I use TAPCO S5s in two of my edit suites. They’re $350 a pair at Sam Ash. I’ve also got the S8s in one of my suites. They sound great but they take up more space and they’re $500 a pair.
I’m a big fan of the MacGurus “roll your own” SATA solutions. I built two 250GBX4 arrays and they’ve been great. If you’ve got a new PCI Express machine, I’m not sure if MacGurus has a card for you. There are PCI Express SATA controllers out there, however. Here’s one: