Would you consider this bad performance ?
https://www.stereophile.com/content/bryston-bda-1-da-converter-measurements
I got one used 10 years ago for almost half of the original price.
When I got it, it blew away every other disc player or DAC I ever had (many !).
Still in use today and can sound better than the analog outputs of the Eversolo DMP-A6 that is attached via Coax spdif (depending on the source material quality).
As much as I would like to get rid of it, it just keeps going.
Also better about 95% of the time Vs a Gustard A26 via USB (which I took out of the system recently and may sell soon).
Comparisons are always at matched levels (within .1dB at speaker terminals) and both sighted and blind with similar results.
It is however very sensitive to the source component via Coax (no USB 2.0 input) so jitter attenuation is not good.
I had the best results with the Pi2designs Mercury streamer V2 before it bricked and almost as good with a Oppo UDP-205 (all via coax spdif).
But I do agree that $10k is way too much for the Briscasti even if this was brand new design with a more modern DAC !!!