You have to set your expectation right. Use SG to prolong the paint, but if you're going to be lazy and only have a few minutes a week, don't expect it to look as good as when you first take the car out. Mind you, the protection is still there, but you might get water marks and marks left by leaves and sap. That said, they're pretty easy to remove with sierra bead.

As with most things, you get best results when you look after it, otherwise no amount of coating will keep. For 700 or thereabouts, its pretty good value compared to some others that cost almost 3 times more.

Some people swear by ONR, but I find that I have to spend more time making sure my cloths are clean. Saves water though.