I have the wide tripper diamond also. I just got it about a month ago and the weather has not allowed me to use it much. Just sitting on it and looking at it makes me think it is going to be great.
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I recently got the wide tripper solo with backrest. Love it. After 3 years of the stock seat, I can't believe how much more comfortable it is - a surprise given that it is so much smaller and thinner. Added bonus: the narrowness means I don't get cramp any more, I feel like I have more control, and the feet are flatter on the floor when paddling it backwards out of the shed.