Just ordered a 702 for sfx recording and was wondering if anyone else finds it helpful to pair it with a mixer. It seems slightly unnecessary although I know it could be useful for certain applications. I am recording with a M/S setup. Any thoughts?
The 702 has a built in MS matrix which is highly flexible. You can decode to your headphones or to "tape". You shouldn't need it if you are just recording 2 channels. That said, I often use the my Sound Devices MP-2 (which has been replaced by the Mix Pre) for channels 3 and 4 on my 744T and I actually find the pres a little more pleasing.
I agree with Michael: A 702 for mid-side is enough. That's exactly what I use. The only reason you'd really need a mixer is to mix in more channels or to have better ergonomics and immediacy for riding levels. There are a lot of other reasons to have a 2+ channel SD mixer lying around (pairing with small hand-held recorders like the PCM-D50 or H4n, etc.), but not for what you're aiming to do!