Gnome backer plays a very loud sound effect on completion. The sound effect is extremely annoying and there is no option in preferences to switch it off. Unless this is fixed, many users do not want to use GnomeBaker, including me. Because apart from that, it is a decent app. But this sound effect makes the whole application unbearable for everyday usage.
GnomeBaker 0.6.4 on Ubuntu 12.04 (64-bit).