I was talking with Phil a while back about this amp, while it was in the beginning, and this amp is not in the league of portable amps at all, it will fall better in the league of the home based amps, or at least bigger transportable amps.
It is a three channel amp, runs in two 9V batteries (18 volts), has a triad discrete dynamically biased diamond buffer, etc....so please do not try to compare it with portable amps, whith more humble topologies, power requirements and targeted for a different use....Xin amps, TMK, etc...while very good amps, are just very small enjoyable portable amps, which target market is different, and they run at very low voltages, so I do not think it is fair comparison neither to compare an amp that runs at 3V, 6V to one that runs at 18 volts, which give you more margin for refinement and to work on a more solid toplogy...