Absolutely the best stuff I have ever used, and i've used alot. If you want shiney do two coats, if a little glossy just one will do it. It lasts about 3 weeks for me (4 depending on conditions), which just so happens to be my wash cycle.
Be very careful which products you use on your tires. Some of these spray on tire shine will leave white marks on your driveway from the silcone in the product. You won't be able to see the marks until the driveway is wet.
Unfortunately I didn't know that till I came home one day and saw white spots everywhere.. It looked horrible.. After a few minutes on Google I figures it out.