I have an Oppo 105 that I purchased primarily for SACDs and DVD-A discs.
When my trusty 20 year old Pioneer PD 65 died I started using the 105 exclusively: stock, it was decent but no cigar. While searching for a red book player, I stumbled across parts upgrades on E bay that looked fairly easy to do.
First, I moded with a easy to install silver IEC to power supply jumper. I was so happy (and now familiar with the power supply area) that I then replaced the crappy OEM power supply with a Linear Power Module. These were both sonic game changers. The icing on the cake was when I installed Machina Dynamica New DARK Matter to the tray, which IMHO is an absolute must for any transport/player
Also, I use the Oppo via its XLR outputs (there’s a huge difference between token XLRs and true deferentially balanced circuits) directly into my dual mono ES 1200 class D amp. I have owned many SS ans tube amps over the decades, the EVS is at the very top. If interested see my thread
hth