I bought the HVX-200 and have been shooting with it for a few months now...although I've been using a Powerbook to backup the P2s onto two external drives. I'm not sure about what's going on with the converters or whatnot (I ended up buying a used, pretty cheap Powerbook instead of the MBP so that I would have the PCMIA) but I have had some experience with the P2store. It works just as promised - you can either use it simply as a card reader, plugged into firewire on your MBP or you could download onto the P2store and download all of your cards at the end of your day. I've done both and each worked fine for me - depends on what type of shoot it is, etc. If you have enough hands on set and/or the time, I feel more secure having each card backed up onto two drives before I format the card. That being said, I haven't had an issue getting anything off the P2store at the end of the day. Hope this helps a bit...