We installed one on our 40.5 in 2000
We are very happy with it. The sail goes up easier and most important it comes down FAST!I never used the type with the cars and bearings, but the simplicity of this system is great.After 6 years of use, I do wish ther was an easy way to rinse out the track because I sense that there is a little dirt or salt deposits or "something" that does slow the sail a bit. In most cases the sail just drops to the deck but if there is almost no wind to flutter the sail just a little, it tends to stick a bit.Bottom line, I would buy it again.