Mine is an XL90, like all my Petes, and I love it. I do at some point plan on other Pete shapes, but I fell in love with this shape when I purchased my first Peterson. They have a thick bowl shaped so that it fits very comfortably in the hand, and is also very pleasing to look at. Although I don't clench often, I think they're quite clenchable although perhaps a bit heavy.
The pictures of the 2015 St Patty's day pipes really don't do them justice. Until you see one in person, the green stain might seem like a bit of a turn off. But they are absolutely beautiful in person.