From your description it sounds like Flows are great for you, that is if
your not super concerned with control. I think that they hold as well as
strap ins but others have said that they don't. Also it has been said they
work better for larger feet, like my 13s. However they work great for my
freeriding and big mountain style.

Bought a set last year after using traditional strap ins and K2 clickers.
They are amazing.
In answer to your question, they are as easy to get into on the mountain as
in the store. However only on your toe edge, if you sitting your heal edge
forget it, you just don't have space to fold down the back. You can strap
in on the lift if you have a little space and they are easier than the K2
clicker system in this respect. Also you can exit the lift standing on your
stomp and while still moving lean back flip the back, step in, latch, and
go. It's great to blow by skiers and watch their faces as you don't stop.

Only two things:
1) When looking into boots make sure you buy ones that has a rounded heal (I
mean when looking at the side profile of the boot). If it is square you may
have trouble getting the flows to open / fold down. But it is not too much
of a problem.

2) The flows are somewhat heavy. So if there is a large difference in
weight between the models then spend the extra money, if not I'm using a
lower end set of FL-11s. They are great.

Have fun,

Ed Arata