I used ragg top when i got my boxster. It worked well. I currently have a 98 model year, 83,5000, Florida car lots of sun and rain. Always garaged at home and the office. After 9 months water stopped beading. I tried the 303 kit next. It is impressive. Nine months later it beads water like the day I applied it. As I have a black box it gets washed on a regular basis. I never use anything but water to clean it the top.The only time I brushed it was during the cleanings when applying protectant. I use my leaf blower to dry the car and a microfiber towel for the final droplets on the paintwork. After the top is dry, which doesn't take long here, I use a lint roller to remove anything left on the cloth top.
I have been using the Wolfgangs leather product. Pretty good results, but it does not seem to last long. It does give the interior a great smell though. That leather smell with a slight oil/gas/hot metal aroma and we are now talking about another part of what a sports car is all about.