I don't particularly like them only because it inserts some additional step (however minor) into the process of getting the camera ready to take a picture. This is obviously more of an issue in an immediate-mode hurry-up-and-take-it photo when the event is not going to last much longer, but that can be the source of some of the best shots. This design characteristic has led me to use only primes from Oly (which can be the fastest solution unless that prime is the wrong length, then it really slows it down). So... While there is probably a very good reason for it, is it possible that Oly will ever make any non-retractable zooms (and maybe they already do and I just don't know it)?