After my Theta Data Basic burned out and Theta could not provided a replacement mechanism, I investigated a large number of transports. I was disappointed to find that most transport/player manufacturers rely on outsourced mechanisms (mostly from Philips and Sony) like Theta did and have the same issues with non-repairability in the future. I couldn’t find a manufacturer who was willing to retrofit new mechanisms into their older transport/players, so in my mind, they became disposable units. I bought a used Simaudio 260DT (transport only) in part because I was led to believe that they make their own mechanisms. My hope is that if they change their mechanism they would make them backward compatible (time will tell).
I have really enjoyed my Simaudio 260DT. No issues after 2 years. It is so much better than my old Theta that the burnout was a blessing in disguise.