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I use Crystal Guard on my Z. The shine is comparable to Zaino, maybe a little bit richer, IMO. Application is defintely easier than any of the other types of wax/polymer.
I like it. It's expensive, but worth it IMO. Relatively easy, make sure you read the CG thread for all the tips on application because they make all the difference. I have 4 applications from the first bottle and still have enough left for maybe 2-3 more.