There is a Neurochrome 686 for sale at present in the US.
I know this Amp's capabilities very well, through being demo'd it in the UK in various build guises.
The 686 I have heard in use on a £200K System compared to the best part of a £50K Soulution Power Amp, with a Solution Pre Amp used for both Amp's demo's.
The 686 being approx' 25 x cheaper was a real contender, and I mean real contender. This is what can be had when the design for the Power Amp has a Parts List that is between £2K - £3K.
Both these Amp's used in the system and environment that was set up for the system was the best SS Power Amp's I have heard in use to date.