Your tranny shouldn't shift 'hard' at any temperature. In fact, it is quite a smooth transmission. The only thing you may notice is that the delayed shift when cold at 50kph is a bit firmer if you are approaching that speed very slowly.
I hope the car is everything you hoped it would be. I have convinced my father to buy one, so he will be down in the city in the fall looking for one.

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'96 C280 (gone)
'97 C36
'05 C230k