I bought a pair after extensive listening and despite what the reviews say thay are better than the Tannoy XT6F XT8F and B&W 683 S2 and Monitor Audio Silver 8 IMHO. They do however respond to a powerful amplifier. I tried the Arcam A19/29/39 and did not like them, on any of the above. I tried the NAD 375BEE and that was very good but just pipped in my opinion by the Roksan K3 Amp. You really have to get out and listen because I fired up the recommended A29/B&W 683S2 combo and sat back and was underwhelmed, sl.soft and no punch and detail at topend and bottom good extensionbut not quite punchy enough. All I can say to people looking for speakers is believe your own ears not those of reviewers because they dont pursue a good combination they have their own favouites and hifi is abour synergies of equipment bringing out the sound potential. My wife was with me and sat through the same 3 CD's for hours not saying a lot until the Dali/Roksan was connected up and then both out eyes lit up...now you're talking. Tight powerful bass, beautiful midrange and incisive and extended top. Previosly the owner of an expensive set up I was determined to listen until I was satisfied and I did just that.
One of the demonstrators was desperate to sell me an Arcam A39 - I have one myself he said. More expensive but you must hear it. I was underwhelmed and he looked at me like I had cloth ears. Sorry the NAD 375BEE beats that I said. Then I got to hear the Roksan K3 and yes it was better then the NAD not by much but both seemed to be able to control the speakers better, the Roksan just a little more refined in the top and a little gutsier in the bass a bit more control. Either would be my choice. For the speakers no contest the Dali Opticon 6 are simply stunning, I cant believe anyone would choose another pair over them unless you hear them on inferior amplification.
The B&W 683S2 - very good with the NAD in the bass, less so at the top end, smooth but not so open. Poor with the Arcam A19 and the A29. The Monitor Audio Silver 8 lacking in real detail at the top and no real extension with the Arcam's. The B&W C8 also tried after the 683S2 and also a little confused at top and bottom end had grunt but less extension
Its all personal opinion, but I'm satisfied that when I start mine up I am 100% in love and satisfied. If you already have an amp take it with you try to find the best speaker for it (but dont forget to try either the NAD 375Bee or the Roksan K3 as comparisons.