Radioheadokplayer,
I own the darTZeel amp and preamp combo and added the Playback Designs MPS-5 this past June. At the same time I purchased a 1.5 meter zeel BNC cable(s) for the MPS-5 interface to the darTZeel preamp.
I also own a pair of Transparent Reference MM and a very current version of the Stealth Indras, both single ended.
Had I not owned the Transparent and Stealth cables, and was then able to audition all three before making a purchase, I personally could not justify ten times more the price (more in the case of the Transparent cable) over the zeel BNC ($600.00 for 1.5 meter pair) in my system.
In my system the zeel BNC is the primary interface used. I do (from time to time) insert the Transparent and Stealth cables for something slightly different. They are both very good cables in my system and I do not have plans of selling either of them.
As a suggestion, before investing the $600.00 for the zeel BNC, you can purchase rather inexpensive 50 OHM/BNC cables that will give you an idea as to what you can expect from the Playback Designs 50 ohm BNC interface to the darTZeel preamp. I did this (amp to preamp) when I first purchased the darTzeel machines and the "zeel" BNC was not available from darTZeel. Later I added the zeel BNC to interface the amp and preamp which added a valued sonic improvement.
One last thing that I would share with you should you try the BNC interface. The BNC input you choose on the darTZeel preamp will require some break-in time as was suggested to me.
