I am currently in this league and would like to highlight three things:
1) Very realistic baseball GM simulation where you manage contracts and talent. You must build for the future while winning now.
2) I find the deep project development approach to be very rewarding- I enjoy researching prospects and trading them.
3) Trades in the league are more fun because you trade both talent and contract status - just like the big leagues!
Definitely an active league - give it a try.