The listing was removed from provantage a couple weeks ago. The only model listed at the MStore is 367926U. I purchased 367927U. I believe the only difference is the latter comes with win8 Pro instead of standard edition. I wanted pro for the additional security features including bitlocker. However, i suspect turning bitlocker on might result in a significant performance hit. More so for these tablets with eMMC memory than a computer with a standard hard drive. We'll see.