No dust here (yet??
- anyway it doesn't look like i will get it)
Audio hmmm... Speaker isn't good (but I've seen worse), headphones are crap (change thm if you have any) but I'm using Creative HQ1900 and I'm very happy
Touch buttons - I personally dont have any problems with them - I only have bas habbit from my viewty to tap with my fingertip (just habbot - i always forget they ara capacitive).