Media management, reconnecting and film editing is exactly the same for XPro and Media Composer. Biggest differences are there are more resolution option in MC and I/O connections. But all the necessary tools to edit a feature is there in XPro. You can even capture 24p with Standard Pulldown via firewire (no NLE does this). So that ‘only on big systems’ argument is not really legit regarding your needs.
Workflow wise, all what you need to track proper key/edgecode, TC, pulldown, audio TC, sync’ing, etc are all within the application. No need to go out (a la Cinema Tools).
I am cutting a short right now shot on 35mm/4 perf. Offline on DVCAM. We will then use Cut List to make a new selects transfer to HDCAM SR. CC on DaVinci or Pogle. Finish on HDCAM SR.
Of course if you are not familiar with the GUI, all the advantages goes out the window.
If you are familiar with FCP and now how to operate Cinema Tools properly, why switch if you are not familiar with your alternative?