Well, I said I would keep you informed. I got my 3 MM glass, cut to 200X200, went to install it, and its too SMALL! The bed is actually 210X210. In inches 8 1/4 fits perfect! I managed to "Hack" it into place for a test print while I waited fro the glass company to cut me the right size. I figured I could at least calibrate the bed.
So, I removes the two metal parts that hold the bed on and placed my glass on it, attaching the two metals parts back. Now, this is important. I used the thumb screws to LOWER the bed 3-4 MM. Then I told the printer to print a demo print. As soon as the extruder moved into place, and it moved the bed up for the final time, I turned off the printer. Then by manually pulling the extruder around the bed, I calibrated by eye and feel. When I was satisfied I fired the printer back up, put glue on the bed, sent it a file to print, and watched carefully. The first part it extrudes on the right side of the bed just to be sure the filament is flowing correctly didn't stick to the bed well. This leads me to believe that the 3 MM glass doesn't conduct heat as well as I thought it would, however the rest of the print came out fantastic. Like the best print I have ever gotten from the machine. Layers were perfectly smooth and even. It was just incredible. (I assume its because the touch and eye calibration did a much better job then the built in calibration could ever do.) So, bottom line, it works! Very well. I think the 3 MM glass is a bit thicker then is needed, but needless to say, it works.
So, here is my suggestion to everyone to help protect your print bed from damage. Call your local glass company (or cut it yourself) and get a 3MM (or try 2 MM if you want) piece of glass cut to 8 1/4 X 8 1/4 inches. Then take it and install it right over top of the glass that's there. It does not need to be tempered. It does not need to be treated to withstand heat. The bed doesn't heat up fast enough to crack the glass. Re-calibrate, and print on that. Then, if something does happen, and you break you glass, you haven't broken the permanent glass that's attached to the element, you just replace your "overglass" you just installed.