I posted this in another knubster thread but thought I would share it hear too.
I just tried out a knubster on my 5'8" Dominator with the rusty R2 quad set. I wasn't 100% so I didn't get a full test. I had shoulder surgery in Sept and tore a ligament in my ankle in Dec. It was my first time out after my ankle injury. My ankle was a little tender so I didn't push to hard. I think in about two more weeks I will feel better about hitting the lip hard. I Did once but a bailed after I hit the lip because I didn't want to test my ankle that much yet. The shoulder feels good when I paddle. I have been good with the rehab.
I really liked it on the waves with a little more shape and size. On the smaller waves it did feel a little to stiff but I also felt week pushing my toe rail in because of my ankle so I know my transitions where not as fast as they could have been. It really did smooth the whole ride out. It made the board feel a little more locked in. I did a couple nice round houses and was generating a ton of speed. I did square off the bottom a couple times but I never really pushed it as hard as I usually do. It really feels like on a good wave you can really square of the bottom and get a nice smooth wrap. I just have to see if I like how it releases. It will be a couple of weeks before I really know how it releases with harder surfing.
I would say that so far it is an improvement on chest to a little overhead size waves with my R2 set. I will try putting some smaller quad trailers in with the knubster and see if it feels better on the waist/ribcage high stuff. Chest high to overhead it feels great to me so far. I'm thinking of having one plug put in my old quadraflex so I can use my Knubster on that board.