It seems very tyre-specific, and affects pretty much anything Golf IV based (so Leon, Octavia, Golf, A3 etc). Mine started rumbling badly with the cheap and nasty directional tyres it had on when I bought it, but the Contis I use now in the summer show no signs of the funny wear. It's a 'sawtooth' type shape on the tyre- I didn't have any problems with the inside edge wearing, which is what the alignment change is intended to fix.
My best advice would be use non-directional tyres, and swap them side-to-side halfway through their life.