I currently own both a 2010 370Z roadster and a 2005 Mercedes SLK350.
Both are manuals.
I haven't had any issues with either top. The 370Z has 30K miles so I would expect this to be the case. The SLK350 has 94K miles and is a much more risky proposition.
Any German car is going to be much more expensive to maintain than a Japanese equivalent. Expect that if the SLK top has issues it will be very costly to repair. Less likely with the 370Z but in the case of a failure a much more economical fix.
|