Made the trip down there today, and hit Peaks of Otter on the way back.
As far as the tanks (including artillery) - highly cool and very much worth it if you're any sort of military history buff. Lots of interesting vehicles from 1800's Gatling guns to a M2 Bradley.
Everything else - phbbbbtttttt. The clothing/uniform displays were disorganized, and the gift shop was closer to a toy store than a serious shop. To top it off, there was a pony-tailed security guard toting a revolver of some sort who was lecturing another visitor about the weapons policy. I ignored him and went about my visit, G27 tucked under my shirt.