Mr. E.Z. Tube is definitely not audiophile gear - it is a platform for learning about tubes (bias, output/input capacitors, etc) without making a huge upfront investment in 'iron'. There are tons of tutorials on working with tubes, this is not one of them. This is a platform that helped me understand what the tutorials were talking about through hands-on experience.
Compatible with a variety of popular tubes (including tubes currently in production).
IR remote control interface (power, volume, 4 auxiliary outputs).
Cheap and easy SMPS (no 'iron'!).
I think it sounds great (but I have awful hearing).
Standard warnings apply: Mr. E.Z. Tube will not hesitate to kill you given the chance. Mr. E.Z. Tube can be run from batteries or an isolated DC wall-wart, but the same precautions apply as when working with a transformer and mains current!
Read on for more.