Musical Design - D150B & SP2B Opinions

I am interested in how this amp and pre-amp compare to other designs incorporating solid state amps and tube pre amps or how they, as individual pieces, compare to other manufacturer's equipment?
Lots of luck John I posted info for the amp,and so far have received zero response. Jeffs Sound Values had a used D 150B for sale at $750.00. Was interested but couldnt get a response here.
Sorry John for my slow response. I have both units and am extremely satisfied. I feel that they will perform at a level of performance far exceeding their price points. They have been very reliable and sound great day after day. Best kept secret in audio. I would compare them with equipment of any price. Good luck.