NUX won a Best in Show at the past Summer NAMM, the fact that Mike Hermans picked one of their pedals for his video series is also very promising: here's his demo of the Tube Man MKII Overdrive - quite obviously, a Tube Screamer clone.

More gain! That was the overall goal. If you’re not playing through a real tube amp, cranked for overdrive, it’s difficult to get  genuine tube overdrive sound.... Click on the title for more