LC audio is an interesting company. They are very quick to adopt new technologies such as schottky rectifiers (now that you can actually get HV units) etc. They have also been good at bringing product to the market in a timely manner -- such as their clocks for CD/DVD players. I have been in contact with them once by email regarding one of their technical claims and the response was quick and polite. They are good at inventing new pseudo technical marketing terms such as ULC, non-paralell capacitors. They will also tell you that surface mount components rule because they are shorter (could well be true all other thing being equal).
The Milennium units have been well received in the Scandinavian market. Reviews range from good to "better than Levinson" -- the latter mostly from the Danish press, and I am not all that impressed with the integrity of audio magazines in general.
My PERSONAL opinion is that these units are a little too complicated. Several gain stages etc, but this is what provides the frequency response I suppose. BTW, I think you get the circuit board ready made and soldered which is good considering there are lots of surfac mount components on there.
I decided not to go for these units after extensive review. Then again, if you search the web you will find reputable people who claim the products are great.
The preamp is an op-amp unit. Opamps are veru good these days -- that's all I will say about that.
I think you can still download schematics from the
http://www.lcaudio.dk or .com site.
I would say it is quite costly when you add up all the parts, but probably a capable performer. I have heard them, but not in an environment that I am familiar with.