Chris, hi there,
Hopefully, you'll be able to find an AKSA owner in Brisbane and thus be able to audition the amp ... confirming to yourself that this is a good way to go!!
However, I thought I'd post my own experiences, just in case there ain't a convenient Brisbane AKSAphile.
I used to have Naim amps - their top amp but, yes, it was a 20-year old version. I found out about AKSA amps on the Web and then discovered Hugh lived in Melbourne so I took one of my Naim 250s over to Hugh's place to do a comparison with his AKSA.
The AKSA blew the Naim away so, as I was of a "DIY bent", I decided it was within my powers to build an AKSA kit. Of course, I could've bought 3 new stereo Naim 250s to replace my old stuff (as I have 3-way active speakers) but this would've been an order of magnitude cost higher ... and maybe not as good!!
All I can say is, I have never regretted my decision to turf my Naims and build the AKSAs. Various "golden-eared" friends I have invited round to listen have also congratulated me on my sound!!
So all I can say is ... go for it!! You will not regret it.
Regards,
Andy