On Destkop there is reason to upgrade if you are using stock software and kernel (as I'm). Unity in 13.10 feels more responsive than in 13.04 was. Pretty much everything is bumped to newer versions. Even things in VirtualBox work faster now (13.04 was installing 4.2.10, but 13.10 is installing 4.2.16). Dont know what is the reason for speed gains - Kernel in Ubuntu or newer VirtualBox. One thing to do after upgrade is to disable smart scopes. No reason to share search queries with Canonical. I was hoping that 13.10 will solve my sound problems, but no luck. Just like in 13.04 i hear crackling noises. But those are specifics of my laptop.