I just want to add a quick long-term use report to this thread. My system has been sounding great recently (thanks partly to some further tweaking of my EE Minimax DAC and a change to battery power for the Sensation). However, we all get the audiophile upgrade itch and I was considering spending some serious money on a new set of ICs to see if I could improve on the Nirvanas. I came very close to hitting the 'buy' button, but I just couldn't do it. Maybe I will at some point, but when push came to shove I just couldn't convince myself that spending several hundred bucks was a good idea when the Nirvana ICs (in combination with Nirvana speaker cables) are sounding so good. The Nirvanas have allowed me to hear the benefits of my recent tweaks. I think they continued to ease in for some time after my initial positive post earlier on this thread and just got better and better. For now, the Nirvana cables still do the job beautifully and really rate as long term keepers. Jason and Virtue have a great product here, and killer value.