I don't know where to start honestly. I have run the full x2, half x3 and the 5k x2 at Glass City and I haven't been disappointed yet.
Plenty of water stops, volunteers everywhere, course marshals and police at every turn/street, great swag, customized bibs, the expo has a good selection of stores, other races and misc. vendors, parking is easy on a college campus, extremely minimal elevation change on a beautiful course (the 'hills' here are more slopes), and last, but not least - the other runners! The runners are so much fun and supportive. I have met people on the course who help to motivate me when I'm close to being drained of all energy.
I can't say enough about how much I enjoy this race.