Received my LP today and have been running it with the stock tubes (although I have some new Gold Lions on hand to roll later). Invited another forum member over to audition for an hour or two. Utilized Nad streamer->Yggy A2->T1.1/Utopia/LCD-4Z. Even with no burn in on the tubes and the amp being on for just 20 minutes, the LP is outperforming every other hp amp I've heard. In the short audition, my friend has also decided to pick one up.
The most noticeable performance boost is on the T1 followed closely by the Utopia. Less drastic improvements so far on the 4z.
On Utopia- soundstage has opened up a bit which was my biggest complaint with the Utopia. Detail retrieval is best I've heard. There is also an indescribable smoothness to the presentation and sense of space. Best bass I've heard on the Utopia is out of the LP.
On T1- this amp makes this headphone a top contender in my book. Soundstage is better than the Utopia (even if some detail is lost). Very enjoyable environment like I'm inside the music rather than just listening to it being played somewhere else. While listening to Roundabout by YES and some old Genesis tracks, I had the feeling I was hearing the tracks for the first time. While listening to one Zappa track, I could hear the wetness of his lips (I know, gross).
Bottom line- sometimes the hype is real. This one is a no brainer if you have the cash. It is a vast improvement over my Jotunheim, and bests my Mj 2 by a good margin as well.
It is hard to believe how well it is performing right out of the box. Looking forward to big surprises as the LP breaks in/roll tubes/explore my music collection again.