This is a nicely made and great-looking amplifier. Solid construction, good quality connectors and although I have not opened it up, from the pictures the innards/PCB look very well built. An opening in the bottom provides access to the gain DIP switches, if you want to try tweaking these.
 
My Audio Technica A700 phones sound great anyway. My only sound source is a PC and I prefer to use a proper volume control... the boost to sound quality from this outboard amp is definitely well worth having - and I now can't imagine living without those nice glowing tubes.
 
The pre-amp function meant I could trade in my amazing Rotel RA1412 integrated amp for a Quad 303 power amp (vintage, without modifications) - I just felt sure that the combination would work well. I am happy to say that the LD MkIII and Quad 303 combination is an absolute winner. My speakers are B&W DM602 S3 if anyone's interested and the whole system just sings (and kicks ass too).
 
The only issues I have had are:
 
1: The amp can easily pick up RF noise and for any proper listening I basically need to switch off the DECT cordless phone and base station I have in my basement office. I will just need to move them further away when I get the chance
 
2: Tube collecting / tube swapping (all this "tube rolling" business) is addictive. If you're the kind of person who will blow the required cash on audiophile headphones and a headphone amp, you are going to end up "tube rolling". I'm sure I've blown £60 / $100 on tubes already. They make great photographic subjects though - and they are just nice objects in their own right. I've had one tube go bad on me (a military spec Mullard - I suspect the seller might let me swap it...)
 
All in all a beautiful product and highly recommended.
 
 

I was about to bag a pair of the open version ATH-AD700 then saw these on the demo stand... The difference was clear. The sound was so much fuller on this closed version. I was tapping my feet!
 
These are so close to perfect it's tantalising. Lovely full and open sound from a very comfortable pair of large cans. Just what I wanted. Tried Grado, Shure and Sennheiser in same price range - nowhere close for my tastes.
 
UPDATE A FEW DAYS AFTER PURCHASE
 
Still really enjoying these, and they have me rustling through my music collection and listening to stuff I have not heard for a long time.
 
What do they sound like? I've always liked *good* 70s hifi - and modern stuff that sounds like 70s hifi. Warm but clear and punchy sound. Plenty of power for ease of delivery. Celestion Diddon 44 and 66... Good Rotel amps... and an all time favourite set of speakers of mine was the Tannoy M20 Gold. That's what these headphones sound like... a top quality "warm" hi-fi setup. A pleasure to listen to.
 
I also need to add that the "auto adjusting" aspect of the design is very clever and really does work.