Yes, I have the E500, and the P770.
I really like the E500, but the E510 has some really cuel features… I would say GO FOR IT. I have only heard good things from it, as a mate in the office has it… I have seen some of his fee-hand zooming, and the Image Stabilizer is absolutely brilliant. The preview function is great for composition… If I could I would have waited a month or 2 to get the 510, but it was a gift, etc…
As far as the other technical specs, they has sorted out the write speed and the USB speeds, so it is far more user friendly than my model…
I will post a photo essay soon…