Review (4/5): Wash & dry face first for best results.  4.5 stars.
It's true what other reviewers have said: you'll get the best results out of the 7865XL (and the others in the 7800 series) if you wash and dry your face first. Then it glides smoothly and works in very few passes. I probably have to make sure I cross each area about three times in different directions (mostly going against the grain of the whiskers) to get everything. If I follow those two basic guidelines, my chin is smooth as can be and the shave lasts all day. If I don't wash first it's still a joy to use, but it takes longer (more passes in different directions to get every whisker) and won't last all day (more like 8 hours).
This item is worth buying, it's fun to use... I'd give it 4 and a half stars. To get 5 it would need to do everything in a single pass, and that's a tall order.
I also like the fact that you can rinse the head under running water to clean it.