Axis. (I like it, had high hopes for it, but found the Core and Lycan to be much better discs. Lycan seems to be the winner for me although a bit shorter distance compared to the other two.)
Dart. (Enjoyed it for a long time but improved with my putters, and other mids leave this disc without much use for me.)
Viper. (great disc but the tweener distance doesn't help me if I've got a Gator and a Firebird with me, which I almost always do.)
FL. (For the life of me, I can't tell any difference in the FLs I've thrown and the Firebird. Look different, fly the same for me.)
Katana. (Actually like this one very much but my courses don't give me the chance to use it often where a Valk or Wraith won't give me the drive I need.)