As I mentioned in my post (which I suppose you read), I have actually tried a few of these OEM hybrids before and have always been dissatisfied for a number of reasons, ranging from the use of TN screens, to the use of resistive touch screens, to lack of proper support from the OS (Windows 7 isn't exactly ideal for a tablet), to lack of mobile connectivity, to lack of GPS, etc. All the tablets I tried were either too focused into being cheap netbooks with tablet functionality (the overwhelming majority) or tablets with keyboards) or into being too tablet-y thus not resembling a PC at all other then by having a physical keyboard.
Microsoft has a chance to change the entire game with Windows 8 and their own tablet here, though. With software specifically designed with a tablet interface in mind and a tablet specifically designed to take advantage of it, the potential to make the perfect hybrid is there, and there's nothing currently in the market that you can use to predict what it will be like, because what Microsoft is attempting is something genuinely new; they finally grew the balls to come out and tap into a market in which Apple refuses to participate. They might not have created the tablet market, but they can improve it tremendously.
EDIT: Finished the first paragraph.