This has so far been an amazing product. The speed isn't so amazing--it's as fast a real PC, but I would expect that on a MacIntel. What's amazing is that Parallels was able to bring this product to market so quickly and in such fine shape. It's so far been stable and very usable. When I heard Microsoft announce that it would take some time for them to bring Virtual PC to the MacIntel and Guest PC seemed nowhere in sight and the only offering was a poor one from WinTel, I worried I had bought my MBP too early. This product has changed my mind.