I just sold my old RS6 speakers. I deliberately didn't do direct A/B comparisons when I initially bought my new Songtowers, partly because there was a small part of me that was worried I wouldn't hear enough difference to justify the upgrade.
But for the RS6 sale tonight I had them hooked up right next to the Songtowers and couldn't resist...
The difference is utterly phenomenal
The Songtowers are not just better, they are vastly better, and I couldn't be happier with this upgrade.