Sorry to rain on Meridians parade , but I really can't generate enthusiasm for this product at its price point. A pre without remote volume these days is useless , a USB only dac is limiting , spatial processing is old hat and never took off and a 1200/2000 quid analog only headphone amp has a 1000 other competitors.
The only place the Prime makes sense given its feature set is on a desktop next to a computer. You don't need a remote because the volume control is always within reach, and every computer these days has a USB output.
Given the competitive pricing for the Explorer and Director, I would have guessed that a device like this would be priced somewhere in the $1000-1200 range. At that price, I'd be willing to overlook the lack of a remote control and SPDIF input.