Yep, I've gone a few times. It's very heavy on the civil-war era stuff.
BUT... There are always a few tables with medieval and renaissance era stuff. One of the booths in particular focuses on medieval, and he's very cool about letting you handle the swords. This can make the trip worth it. If you have a spare $5k or $10k, you could even take one home.
Polearms are cheaper though, sometimes under $2k.