Back when I did my PPL spins were part of the syllabus. It was quite difficult to get the C150 to spin as opposed to spiral dive, and one method we used was a flick entry. There have, however, been accidents over the years that show that the normally benign 150/152 can and does spin viciously. And I suspect, like many aeroplanes that don't readily spin, when they do spin for real, recovery may be prolonged.
I've spun quite a few aeroplanes (150 / 152, Chipmunk, Citabria, Yak52 come to mind) and thankfully never had any recovery issues. Only in the Yak did I have a parachute, but knowing what I do now about how spins are not necessarily repeatable (each can be a bit different to the last and occasionally you might get a very nasty one) I wouldn't do it now without a parachute and plenty of height.