P's are heavy and can be downright clumsy if you don't have a very solid stand or tripod. And beware of the fact that cobbled-together C-like versions from left over components of misc camera styles often show up, deceptively listed. There were also several generations of P's, and the older ones might be pretty worn out by now. A newer deluxe version is the 4X5 X-series. It's basically a geared P without the all of the expensive scale markings. But F2's are also excellent for studio and architectural use, and a lot more portable. Avoid the old F+. My favorite Sinar series is the Norma; but it take take some patience finding a clean one still with pristine bellows. You can interchange later Sinar box and bag bellows if necessary; but the original Norma tapered bellows is more versatile. The Norma was prior to yaw-free controls, but that feature is nowhere near as important as marketing propaganda has made it seem to be.