The framelines of the P's viewfinder are reflected, not projected like on the M-series Leica and the Canon 7/7s. Because of this, some viewfinders of the P have aged well, some haven't. Always look at through the viewfinder of a Canon P before buying.
That being said, the P has almost a cult-like following. A simple but very high-quality 35mm rangefinder camera. The Canon 50/1.4 is a superb lens too. It's relegated my collapsible 50/2.0 Summicron to my closet.