Flugelhorn mouthpieces

[flugelboy]

I am in the market for a new flugel mouthpiece. Up until now I have used a Denis wick 4f but hear good things about the alliance mouthpieces. Can anyone tell me anything about these please and what would compare with the current one I am using. The dw produces a lovely tone which I do not want to lose but can feel a bit uncomfortable after playing for a while. Thanks