I also had an Oppo BDP105 and I upgraded to the PS Audio DirectStream DAC. I remember not playing a record for weeks after adding the PSA to my system. Very analog like without losing any detail. It is definitely is a superior unit than the Oppo. However, since the PSA uses a field processor gate array (FPGA) and not a traditional DAC chip like SABRE, AKM or Burr Brown, it is software upgradeable. This means each upgrade can change the sonic characteristic of the DAC. The upgrades do not have to be applied but in general each upgrade is an improvement over the next. So when someone likes or does like the sound of a PSA DAC you also have to know which version of the software they were listening to. The most recent version is code named "Snowmass" and the prior was "Redcloud" Here is a thread
on the sonic differences that people noticed in their systems. If you like stability and don't want the hassle of dealing with software upgrades like a computer then I would not look at the PSA. If you want the potential of your DAC getting sonic improvements without having to buy new hardware every 2 years then I would look at the PSA. Every upgrade is free and you can run any prior version if you don't like the latest. Good luck!