Anyone have any experience with Donald North headphone amps

Does anyone have any experience with the Donald North Stellaris headphone amp. I would be using these with Focal Utopia and Audeze LCD - X  Headphones.  It’s a small company and the products are sold online.  Anyway, I live overseas at present so no opportunity to even do a home trial.  The alternative I was considering is the Woo Audio WA5 ... some other great headphone amps out there as well.  Any thoughts you can share?