I don't like how they stick out, but I play them that way anyways. For both the light, and avoiding the need for batteries in my GBC.
(though my GBA SP recently deciding to start resetting randomly on GBC. Replacing the GBA's battery seems to have helped, but I got an official AC adapter for my GBC as a backup. I was surprised to find it's almost as bulky as the NES and SNES bricks. :P)