I also purchased the MindStor 10G. I have taken over 1,000 pictures using my D100 and the 1G IBM microdrive without a problem. I carry the Mindstore unit and offload to it when the microdrive is full. It's still early but both units have peformed flawlessly. I save all in the NEF format. Oh and yes I also have firewire on my PC. As far a power consumption and write speed goes I find they are both acceptable. My estimation is that I can take somewhere between 200 and 400 pictures before my battery runs down then I merely pop in my second battery and I'm good to go. Thanks for your wishes that I be on the good side of 50/50 issue. So far I think I am.