Don't see any reason to upgrade, it fits ideally to my needs. Shimming the battery doesn't help and neither does the bp50. Intermittently, power is lost but is restored by tapping the camera near the display. On occasion, when the power is restored the flash will fire even when closed. A newer II seems to be having a different problem.
Power is lost after the exposure.
So far this happens very infrequently. Also, on the earlier camera the metering symbols have wiped off. It is a very wonderful camera to operate. Only problem is we can't find the part we need, command dial, close to us. We are being told we need to change the entire top plate.