Our in-use experience with the 700, has been more than pleasant. The performance delta over the 600Mhz version, was quite noticeable, and proved quite stable.
In fact, I have yet to see a non-thermally overclocked PC move Windows around so fast, that if you blink you might just miss something. Using the same "Fester" motherboards that we used for our review of the 600, we had no problems just taking out the old chip, popping in the 700, and firing up the computer. One of the coolest features about the Athlon design, is that there are no jumpers to mess with, and no BIOS settings to tweak with, making upgrading chips an easy task for those us of who used to ride the "small yellow bus" to school. Obviously, this will upset the "hardcore" overclockers out there, but rest assured that there WILL be motherboards out SOON, that will let you overclock through the BIOS. It's even rumored that the upcoming Athlon board from ASUS will have this ability.