Size for one thing. The FR2 is huge. The 722 is a tad smaller than the v3. Also the 722, like all other Sound Devices units, will be basically indestructible. They are built like tanks. Laptop hard drives are used over flash drives or 1.8" hds, which means you get way more space and don't have to worry about running out at a show.
I'm sure there's more, but that's why I want a 722 over an fr2.
size isn't a big concern to me as the FR2 is still smaller than a laptop.
I realize SD products are built like tanks...I own a MP2
I would be recording at 24/48(or 44.1) so space isn't a issue, plus the 1.8" drives are pretty cheap, not to mention easily added to a DAW via PC Card reader.
I just dont like the ergonomics of the 722/744. way too many leds on the front and everything is bnc connections so you need adapters, etc. . .
I'm sure SD will get the firewire issue fixed before release, but the 'plusses' do not, imo, justify its $1000 increase over a modFR2 as of yet.
hopefully we will know more when it is actually released/fully tested.