I can't speak to the 15, though I have a hard time believing you could tip it going forward, maybe if you tried really hard and had the keel loose?
I can speak for the 19, and it's quite stable. I climb all over that boat, whether sailing or not, single or not (I've actually lashed things down and let the boat sail itself while I sat in the bow pulpit, feet in the water), and never thought twice about it. You can tell the difference with the keel up vs. down, but it's the difference between a Cadillac and a Corvette-one's squishy, one's firm, but neither make you feel like you're in danger.
The M-15, by all accounts its a fine boat. It's all a trade off, it's probably got more ultimate stability with the heavier keel, less initial stability due to keel shape (don't know, never actually seen one)? You can't beach it, it probably is harder to get on/off the trailer on a shallow ramp. Bottom line, you can't get everything you want in a 15 foot boat (or really, any boat for that matter!). Both the P-15 and M-15 (and P-19) are great compromises.
J.J. Falkanger
Cary, NC
P-19# 792 "Fozzguppy"
Boat Pictures at http://members2.clubphoto.com/jj119874/
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