My wife and I have owned a KHS Cross tandem for about 1 1/2 years. I have never been terribly impressed with the front derailleur and the chainline. The front derailleur must have a fairly weak spring because it will only downshift if the pedals are nearly completely unloaded. Even then it may take several revolutions before it happens. The chainline is also an issue. The bike is 3x8 or 24 speed as equipped, but only 1/2 of them are usable. The chain will actually rub on the next bigger chainring and the shifters do not have any 'feathering' clicks.

Does anyone else have some or all of these problems, and if so what fixes have you come up with?