I've some. So far they have been nice and warm and haven't leaked at all .
I don't ride in proper rain but have got caught out and ridden on soaked/flooded roads so the boots have got properly wet.
My only complaint it the neoprene ankle bits tend to get a bit sweaty, but that could just be me...
I'd of thought they would be waterproof so long as you do something to stop water running down from your legs.