Just updated mine tonight but it was already too dark outside to do a test flight. I had been having some GPS sensitivity issues on 1.6.8, it seems. Whenever I get to around 90-100 meters AGL, I lose GPS lock (The number of satellites would drop from say a healthy 11 to a dangerously low 4).
Prior to knowing the restrictions about flying, I've had successfully flown it to 250 meters AGL in the same vicinity using an older firmware without issue.
All the feedback on increased GPS sensitivity makes me hopeful and will sure be a welcome fix (no pun intended) for my P3S.