I think some people have gotten a little over excited by all this discussion. Let me try to alleviate some fears.
If you happen to receive one of the units that has the demo build, you are not getting a non-functioning tablet. You are getting a tablet that has Android Honeycomb 3.0.1 which works very well. You can install apps, browse the internet, check email, watch flash videos, etc.
The main thing you cannot do on it is the update to 3.1 or 3.2. Beyond that, the only other things it won't do are the features specific to 3.1 and 3.2. So... if you are not dying to have some specific feature of 3.1 or 3.2, why not use the tablet (taking very good care of it) until Woot and Motorola gets their act together.
It has been mentioned in a couple of posts that Woot/Motorola MIGHT do an advanced replacement (e.g. they send you the replacement AND THEN you send them back the demo unit). If that ends up being the case, you will only have to wipe your date off the demo unit and install everything on the new one. You might actually end up having more down time if you take the refund and go to Staples (and what if you get the refund, go to Staples, and they are out of stock?)
Patience! I think this will all get worked out. Until it does, why not enjoy some Honeycomb 3.0.1 goodness.