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I agree with Stephen that the claimed FOV is not what is sometimes claimed with these cheaper eyepieces. I don't think it is possible for a 50mm focal length 2" barrel eyepiece to be 68 degree FOV and it seems more like 52 to 54 degrees to me. I think the 40mm reverse kellner is supposed to be 65 degrees but again it is seems a bit less.
I forgot to mention in my previous post that I am using these eyepieces in a 6" f15. The long focal ratio goes a long way to minimising the problems with these modern incarnations of old eyepiece designs.
The 30mm Andrews UW is another good value eyepiece in my opinion but it is heavy and this can bring it's own problems when swapping eyepieces around during a session depending on your scope set up.
regards
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