i have 2 answers
ANSWER 1: no b/c I don't see why I should have to pay to update a device what is buggy like n900, it should be put correct free. if they was to charge to put a device in stable state then we'll end up having Companies intentionally putting out buggy devices so they can make a quick dollar on the update.

ANSWER 2: if the device was stable and practically bug-free to start with then I would not mind paying for new features in a update as long as the features make a substantial difference to the device's usability