I think it's actually Featherweight, isn't it?
In any event, I grew up learning to shoot a shotgun with my Dad's 12. Used it to hunt quite a bit, too.
One thing is that they are considerably lighter than other shotguns, so with heavier loads the recoil can become wearing quite fast.
I shot 4 boxes of shells dove hunting one day, not heavy loads by any stretch of the imagination, and I thought I had been on the losing end of a bar fight that evening.
I've never found them to be particularly difficult to strip.
Last year I went to Iowa to visit friends, and was in this little gunshop when a guy walked in with his 37 in parts...
The shop owner couldn't figure it out, either, so I waltzed in, slapped it back together in about 2 minutes, and made everyone happy.
A couple of years ago a bunch of police issue 37s were on the market, and I just didn't have the money for one at the time. I also by that time had a S&W 3000 riot gun, so it would have been redundant, but oh so fun.
All in all, though, it's truly one of America's overlooked classic firearms. I wouldn't be surprised to hear that well over 1 million have been made since they came out.
Coolest thing about them, though?
The movie L.A. Confidential featured Ithaca 37 riot guns prominently!