You've been misinformed. The GPU comment was a "what the heck do you _think_ is mining on P2Pool", and yes, I was laughing at people's capacity to buy into FUD and misinformation. Don't take it too personally.
The issue with higher-than-desired rate of stale shares has been resolved with P2pool ?
Sorry for the derail, but it was my understanding that you will lose close to 1% of your work to stales on p2pool vs ~0.1% stales on other pools.
Is that no longer the case ?