I am a life long Quaker State and Supertech user, but was never really interested in the syn offerings until the rebates. I was able to pick up a few jugs of Q-Horsepower for $8/jug, and then really scored on the Q-Torquepower, finding some for $5/jug!
Let's just say that I take full advantage of the syn and as I get older, enjoy not having to change oil in the winter time.
I'll run it to 8000+ miles and change it in Spring.
The same goes for my mother's '08 Cobalt. I ran the factory fill, one 5K run of PYB, and it's been on Q-Torquepower ever since, following the OLM.