I can't speak to FS, but I've been using a Citidisk HD with the HVX200 for a little over a year now. The Citidisk and I have a very tumultuous relationship. It took me over two months of wrangling with their tech support people to get it to work with CS3, then it completely broke a couple weeks later. They sent me a new one, and it's held up so far. It hasn't trashed any of my footage, but every time I use it, it breaks down at least once, creating an embarrassing ten-minute pause in shooting as I desperately turn it on and off hoping it hasn't died like my last one. I honestly only use it if I absolutely have to now, and handle it like it's made of glass. I wouldn't recommend getting one. I hear much better things about the Firestore, even though it's a bit pricier. Also, now that there are 32GB cards, drives are becoming less of a neccessity.
