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I, too, have a Z3, which I 'love.' IMO, you strap on the Z3, become one, and you really have to drive and control it. In my 550, it responds to what you're thinking.
Difficult to answer the one thing I like, as I love everything about it. One thing that comes to mind is when you think you're really powering up a hill, you can apply even more pedal -- makes me smile.
If you have the extra cash, go for the 550 instead of the 535.
Good luck and let us know what you decide.
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