The 350.8 us the very latest and gas several upgrades .it us a Fantastic amp. Several things to note Nelson Pass doesnot like using fuses for a good reason,because fuses suck and are bottlenecks. He uses a breaker that is not a negative in the circuit
He uses more mosfets on the outputs ,and several other improvements. One thing higher biasing into pure class-A
Almost 20wpc before it croses over into class AB.
Meaning more then half of your music on normal listening
Will sound even better being in pure class- A ,also depending how inneficient your Loudspeakers are and doubles power into 4 ohms,and 2 .
The only amplifiers close to this price class that may be a little more refined is the Vitus Amplifiers ,or Gryphon both from Denmark.