hi. i can tell you bout my experience with flow in bindings
even though I'm not a pro...
when I was a beginner a friend told me to try them and then I got used
to them and now I've been using them for three years
(girly, I know
, but it was the only ones they had in store at that time)
I found out that these binding are the best use for beginners and deep snow.
I like powder and I can move more quickly with them then with ordinary bindings,
and I've tried them as well.
can't really say anything about spec you should look for but I can see you've
already got the answer to that one