I have a pair. By far the most comfortable boots i have ever worn! Nice and light too. I don't feel nearly as bogged down as I do with other boots. I highly recommend them.
I have the 5mm version. I love them until it gets really wet and muddy. I'm not sure if it's the way my foot strikes the ground or what but I've nearly busted my butt 4-5 times this season already. Last year was the same. I think it's a combination of my gait and the tread pattern but I'm NOT sure footed in them AT ALL.
I don't have that problem with my Irish Setters, the are not a rubber boot either though.