I started out on a P16 and later bought and sold a P18 (had it 3 years). I'm ugrading to a faster 16 footer now (F16) but I still have the old P16 and to be honest I just can get myself to sell it. I have owned that boat for 7 years and I love it as a throw around boat in the heavy stuff.
Bets part is that I found it to be a good singlehander while it is a doublehander design. I have the replacing forestay jib setup and love that to bits. I prefer it over the zippered jibs. When I singlehand I have a special wires that I hoist instead of the jib and thus tension my rig works great and very fast. Even setting and dropping the jib takes seconds. Thy that with an old zippered jib.
The P16 will be fun with agreat to although the crew should not be to heavy. The P16 design was intended for doublehanders weights of less than 325 lbs.
As a fast catamaran I can advice that boat it is a good compromise ( doublehanded / singlehanded) for often a very affordable secondhand price. Hell, like I said I still sail it when I'm out on an evening just having fun.
Wouter