My 7 year old daughter has been on the technical preview for the last 3 months with very few issues.
She has a low-end AMD 64bit and it runs seamlessly. She does spend a lot of time streaming from Netflix and surfing kids colouring and dress-up games, but I have to say she has taken to it very well.
We have had a couple of occasions where the OS has booted and hung up straight away, mouse moves but the soundcard made and audible click on every pixel the mouse scrolled over. Quick reboot and it cleared.
We also had a major update last week which took some time to settle down. Then again, Emily is impatient and probably rebooted the computer during the update a few times before calling for tech support
. It didnt die though, resumed and completed its task without too much interaction. Something M$ was never that good at in the past... scowls@Vista
Its pretty stable even in the preview builds, the interface is intuitive and it appears to have been built from Win7 and not the horrific touchscreen/metro builds of 8 & 8.1(which might as well have been labeled Win9). Considering the spec of computer its running on, its really responsive too, even Aero desktop is running on the onboard video which i wasnt expecting. Mem resources are much the same as Win7.
Overall, Im impressed and could run it daily if required. Although besides a few minor additions and a visual workover, I still dont see a reason I would need to be running it. Win7 is not without its faults but I hold it in the same regard as i did with XP.
I may even choose to support users on this OS when it rolls out, ive tried to avoid messing with the last 2 unless its about 'upgrading' to Win7