I've been running the Odyssey 680 at 14.5lbs for years now in both my GN and Turbo Talon. Got one just a few weeks ago with the metal jacket for $130. My Talon's got drained twice and the colder weather was causing start up issues.
They're fine as long as you don't drain them for a long time, the everyday driver thing will be fine until you really drain it and then hit a cold, cold winter. You'll want to start the car every 12 hours if you've killed it once if it sits outside.