Stable. The only sponaneous reboot I have witnessed wadue to overclocking.

Having refrained from installing any dev - testing repo - app untill 2 months after clean PR1.3 I can confirm this system is very stable and the outnof the box experience is quiten great. Even in hot countries.
However reboots may still be required for optimal speed.
PR 1.2 + Swappolube needed reboot every about 2 weeks with my usage pattern.
PR 1.3 naked a little sooner.
Now testing PR1.3 + Kernel power 46. No problems so far.