Well, I have 300 plus hours on the Karan amp and the sound is one of those sounds that is able to take your breath away.The reviewer of the amp is smack on in Hi Fi+,it has the ablity of tubes in the imaging dept.( the images are able to be warm yet neutral in sound)-I 've never heard such detail as well.The high end is very extended yet is sweet and airy and never gets aggresive( unless the recording is hot-not that I would listen to anything but audiophile cd's!!).The bass is very taut and doesn't suffer from too much overhang.The tautness allows instruments to sound so lifelike in the way the energy is created from body of the instrument itself.The amp is able to play extremely loud with no hint of compression or distortion coming from the speaker;in fact the speakers totally dissappear and are no longer needed.The Karan amp has a build quality that is truly first rate and runs very cool even when the Wadia is runnig wide open. I have not heard the Dartzeel, but if the HiFI+ reviewer gives credence then I think I have a very good idea of what he is alluding to in the Karan.If your funds allow for it,then do try to hear one so you can make up your own mind as to when it's Magic becomes a musical experience.Take care Dennis