What is the difference between Maestro versions A and B

I'm not aware of any feature differences with one possible exception:

The A model, like I own, has an annoying problem that makes it boot up with no human interaction..

Here's the scenario that I have actually experienced:

1. The unit is off but the AC power supply is plugged in to keep the soft switch circuitry from discharging the internal battery while the unit is in storage.
2. The AC power is interrupted then re-established.
3. The unit boots up all by itself. <--- Nothing else I own does this.
4. The AC power then goes down and stays off for a few hours which is long enough to discharge both the main battery and the tablet's internal battery.
5. The next time you go to use the unit it is dead and can not be rebooted even with AC power.

You then have to disassemble the unit and recharge the tablet's battery separately since the internal charging circuitry won't charge if the battery voltage gets too low. If that doesn't work then the unit gets a trip to Texas for service.

I have been told that this doesn't happen with a B model. I have no first hand experience with a B model so I can't say if it fixes the flaw or not.

My "fix" is to store the Maestro with AC power from a UPS so it's really not a deal breaker.

Cheers.