Before the last update to the Imacs I went to the apple store many times to try them out and thought that the keyboard was really nice. Very little pressure required to push the keys and the short throws was great. Two weeks ago I bought my 24 inch imac and the keys are much harder to push. It is similar, but a little less than what is required to click the apple mouse. Because I have tendonitus in my fingers and wrist this was a problem. So I went to a best buy to try other keyboards and found 3 imac keyboards on display and all three had keys that were easy to push. Has anyone else noticed this? Have the keys on the aluminum keyboard gotten harder to push or are there different suppliers? Some easy, some harder? Would apple replace it and would it make a difference?