In reply to Pete Dangerous:
> I don't think there's a lot to learn on overhangs.
I'd say there's more to learn on overhangs than on other angles. It's more important to to be efficient and keep good body tension, keep your centre of gravity close to the wall, pace yourself well, because you'll get punished on steep routes if you're not doing those things well.
And you do need balance on overhangs too. Ever seen somebody flag on an overhang?
> They just make you strong and help with stamina.
It does give you good stamina, probably won't get you much stronger, unless you're trying really hard, and most people I see down the wall don't try that hard. To get stronger the individual moves need to be hard, so you're better off getting stronger by bouldering, or training specifically.
> They are fun though.
They are fun, and the best part is you can fall off them all day with no consequence, so you can really push yourself.