I have been considering for a while now to switch from the MS3.0 to the WMO. The WMO is a bit lighter and easier to handle, but at the same time I've been using the ms3.0 since 2002/2003 (The same one!) so I am very familiar with it. The only real reason I am considering changing is that I've heard that the MS3.0 buttons are hard to press and therefore cause a delay compared to the WMO. Either way I buying a mouse, as my MS3.0 is really old and I'm not sure how much longer it will last, so I might as well buy a replacement while they are around.

Is there any real evidence for this, is the lag amount enough to warrant a change and what would you do in my position?