I received my Concerto today. I Installed a Pokey and then updated to the .95 firmware as soon as I opened the package.
It passed all the RAM tests and works flawlessly on my A1/w Expansion port, UAV S-Video modded 7800 with an older Transend 32GB SD Card.
I also have a LHE modded A3, and a bone stock A1/wo Expansion port systems. I plan to test it out on those in the next couple days and will report any issues in the firmware thread.
Thanks again for this awesome hardware Batari!