the scroll wheel at the back of s90, not everyone will appreciate it cause it turns very easily...the zoom lever place close to the center, is also a bit funny for me.
i have small fingers but somehow i feel there's a lack of space for me to place my fingers, maybe former ixus users can adapt better than me.
the electronic pop up flash is also a turn off...wonder actually how fast can a user pop up the flash if he have to go into the menu without being able to pop the flash manually.
size, iso 800 performance, AWB and the aperture ring are the plus points of s90.