Well the TWO has been discontinued for awhile now, but the ONE.2 is most definitely the better one. The circuit and layout has been slightly revised, but the greatest improvement came from the stepped attenuator. It's very surprising to be honest, but I can confirmed this with another customer who previously had a ONE and TWO and now a ONE.2.
The latest model, the TWO.2, will be available very soon too. But the best Virtue amplifier so far would be the M901 Sensation
I'm hoping to visit Tony again (AudioAddiction) and have a session with the JB3 and ONE.2/TWO.2 amplifiers, should be fun!