Julie,
The Meguiar's products have worked great for me. I use about every product they make!
I have no problems with stickiness. The vinyl conditioner/cleaner is used in their marine line, which is why I decided to try it. It was cheap and readily available (actually I had a bottle just for cleaning my new car). I just couldn't see making a trip for 303 when I had Meguiar's at my house.
I'm sure 303 is a great product.