It's free because only someone a brick shy a load would pay for it. It really does not offer any advantages as there are no 64 bit applications out there yet AND it is less stable than the current release of XP.
Most of the drivers are still 32 bit. The few 64bit drivers out there are not the most stable in the world.
I am not looking forward to them releasing this. The flood of problems I will get called/emailed about will be immense.
Of course it will get better. In about 3 years it will be as solid as XP is now.
Loghorn? OY! Based on the .NET architecture, it requires you to have an Internet connection so it can get files/functions you need to run. The goal is to no longer supply updates for the operating system. Intead, MS will change the base code, and when you boot, it will grab the code directly from them. It will make the release OS pretty small, but the initial start up will be painful.
Dun't look for this in the initial release, but it is where they are going. Hackers paradise for sure.