I've never felt like I've had a bad experience in any CO/UA FC seat. Guess I'm just happy to be up front.
My worst FC experience was about a year ago on an AA MD80, where the guy in front of me reclined into my tray table and my drink spilled on my lap. I also get to try the pmUS FC cabinn on a couple of their Airbii next week...I've seen posts in the AA forum complaining about that experience.