I once got similar boards for LM286 and they were convenient to use and sounded quite nice. But the on board PSU was limiting its performance and had to be stereo from same PSU so you couldn’t do a dual mono system.
You can also find something like this on eBay, even fully symmetrical
https://www.ebay.de/itm/32559803574...IkhxjHJTLq&var=&widget_ver=artemis&media=COPY
https://www.ebay.de/itm/32559803574...IkhxjHJTLq&var=&widget_ver=artemis&media=COPY