If he’s a good boy, with good middos and yiras shomayim, and he wants a similar life to the one you want, go for it. He isn’t New Square type anymore, so why is it relevant what they are like?
It would make sense to find out why and how he left, just to make sure it isn’t something that would have a negative effect on your life. In other words make sure he isn’t a anti-establishment, bitter angry guy.
Probably he’s not.