Yes - I haven't heard (or experienced) a bad report over 120mph for these cars....(slk32's included).
But I'm still wary of my hard top.
Will continue to test top down...;>)
At my local race track there is a long sweeper into an 1/2mile straight - still not long enough to get over 125mph and allow time for braking into the next corner.
There is a 1/4 mile drag strip there as well...it gets packed out every Wednesday night by all the local "hoons" - by the time you get to the start heat soak has set in well and truly...

Co-ords
33°48'11.93"S
150°52'5.67"E