As an owner of a Tube Dac-11 for several months, this is one of the best dacs that's been offered here, and certainly at the price. Very good sound. Even better by swapping out the (single) tube for one of the suggested ones (there's a spreadsheet on a Grant Fidelity forum thread). The inexpensive "Russian Rocket" is very good.
P.S. See my post below for forum and review and tube links.