IMO, a must as well. Josh is down for the New Year until Feb 12th but that is the latest and greatest version. It will take gen parts, an ETA mvt, hands are the same. The only thing that doesn't work is the dial feet. You will need to clip those if you put in a slow beat ETA.
The reconditioned ETA 2846 that Joshua sells will need service when you get it and it's on an older version.
Jim