Low stress.
I like the 150 because I can find parts. It is easy to work on, safe and has a lot of performance and capability when compared to other planes with the same engine mounted on it.
It is nearly guilt free in the sense that it is almost cheaper than a small boat or snowmobile to own. They hold their value and often increase over time.
There is often a lot of demand for the 150. However most of all they are fun.
Jim