I paid full-whack for mine. But I don't care. If they'd cost £500 I'd still be happy!
I've owned a lot of excellent speakers (I still have half-a-dozen pairs clogging up cupboards around the house), but none which are so perfectly involving. It's always been about the 'hifi' stuff up til now- and there's nothing necessarily wrong with that- but the first thoughts every time I hear the Dalis is "Wow. This is a great track.". The electronics just disappear. The performance so complete, it takes over your entire attention. Albums finish in what feels like a few minutes, and it's over to the CD rack for the next one.
The bass (as said many times before) is truly staggering. Depth, slam and clarity, with not an ounce of flab. Electronic music is simply incredible, with the excellent tweeters doing such a great job that William Orbit's version of 'Barber's Adagio for Strings' almost makes me spontaneously combust. And when the bass comes in, it's properly euphoric. Takes me back to my clubbing days, sigh...
Switch to something mellower, and the music just pours effortlessly. Everything is present and correct, and if you want to, you can follow individual strands of the music. But the speakers' infectious character soon sucks you back to toe-tapping and head-nodding, with your eyes closed.
As for these versus the Q Acoustics Concept 20s, it's definitely an audition job. There are camps for both sides, but having not heard the Qs, I can only spew forth about the Dalis.
But anyone who does take the plunge and buys a pair of these without auditioning first (like myself, ahum...) will unlikely be disappointed. They will probably be thrilled.
One final re-echo of an important point: let them run in! Mine sounded- quite frankly- horrid straight fromt the box. A couple of hours brings significant improvement, and they just get better and better.
To say I view these speakers as probably the best £300 I've ever spent on hifi, would be an understatement. And they work extremely well with the Marantz PM6004/6005, just for the record...