I personally like GC, and have used it in all four of our current daily drivers.
It is in the Subaru right now, and will go in again at the next change.
I have used the 5w30 flavor of Syntec in the '99 Accord and noted no problems.
The Honda is admitedly easy on oil, and does not require anything thick.
GC is a pretty good buy when Syntec is offered as part of an oil change special at either AZ or PB.
You can always get better deals on M1, PP or Synpower, among others, with MIR. You don't often see MIR deals on Syntec.
Aside from GC, the lack of great deals as well as nothing special in the oil make Syntec an afterthought for me.