Flows are a touchy subject with most boarders. Most will give you the argument of "Flows are gay!" when they've never even tried them before.
They're the marmite of snowboarding. You'll either love them or hate them.
Its a speed vs control thing when it boils down to it. With no straps, flows are less responsive. It tales slightly longer for the bindings to transfer your weight through to the board. However, they're easier to get in and out of on the hill.
If you're not doing anything too demanding I'd consider them or at least give them a try
I ride with K2 Cinch bindings on the hill for the same reason. They're a hybrid between flows and strapin bindings. It saves me tons of time if I'm stopping to take photos, etc.
For Dryslope I've got a set of Rome Targas on a shorter board. The toe binding can be used as a traditional toe strap, a toe cap or anything in between. With rotateable highbacks they're night and day difference to the K2s. The slightest movement of your feet will turn the board.