I havent seen any negative views from Rocket owners.
Im on my 2nd Exedra and I like them much better than the Metz for wear.
I also wanted the extra half inch of height.
Yes,Im pretty sure the inaccuracy is built in on purpose to stop law suits etc.
(although my commodore shows a slower than actual speed by %2-3)
Odometers are usually accurate because warranty work is attached to it.