Would appreciate hearing of folks' experience with kayak trainers. I want to get our fitness club to add one to our facility for winter training. We have a couple of those Concept 2 rowing machines and while OK - don't come close to mimicking the torso effort of paddling. The two main training units I have found on the internet are the SpeedStroke by KayakPro and the Vasa Kayak Ergometer, but likely there are others. Thanks.