cgminer does work well for a lot of people, but if you're mining scrypt coins on your GPU then you're stuck with the 3.7.2 version (or earlier).

For me, I've had some issues with running both my R9 290's effectively under linux. So I'm hoping that sgminer may prove to be the way foward.

Since I originally started this topic thread, I've been looking at the source code in order to try and help resolve my problems. I currently believe that it's down to an AMD driver issue - but we'll have to see. Anyway, this has given me the opportunity to make my very own contributions to the project - so I'm hoping that they see the light of day in the near future!