These came out last year. I have the previous version of the monoblocks that I have had for several years (4 of them in bi-amp configuration, powered by two 16AH LiFePO batteries). They sound excellent. I inquired with Temple Audio whether I would hear much of a difference with the 2017 version. John's reply included
"There is an overall quality improvement with the new monoblock not just the power. But its quite slim. Its noticeably firmer and more controlled in the bass even at low power. And the treble remains very clear under bigger transients." and
"Its difficult to say for certain whether it would be a substantial improvement in your system compared to the old model but everyone so far that has upgraded to the 2017 model has been more than happy. "
If you have not heard the Temple Audio monoblocks, I would certainly recommend a listen (they do a 60-day money back guarantee), especially with batteries. I have not yet been tempted to spend £1000 to upgrade.
Cheers
Alastair
RPI4/PI2AES running PiCorePlayer/LMS-> AQ Carbon AES -> Topping D90 DAC-> Khozomo Passive Pre-Amp -> 4x Temple Audio Monoblocks powered by 2xLiFePO batteries->Van Damme Black Bi-Wired to B&W 804 Nautilus and Sommer Carbokab 225 Interconnects