I only heard of it from a fellow who is using a very expensive Japanese preamp in his very expensive system and he bought one! I had to listen to one so I took a long ride.
Well after hearing it I decided to order one. It does something special in the middle of the soundstage that I have never heard a preamp do.
I will try to explain. Take a balloon that haphazardly floats around and now add strings to it and a platform and now it floats consistantly, smoothly and can even carry people, this is what this preamp does. Pulls everything together and fills the 'spatial' information so well that when you return to your regular preamp, its like a hole. I am still trying to digest all of this and I am sure the TRL is part of this.
I can't wait till the TRL breaks in. I have barely 40 hours and what I am experiencing at this stage with my Single Ended stuff and this new preamp is very exciting!