Things are looking bright for Leinster, so I think it is more than worth it. I'm sure you won't be disappointed!
It depends on how much of a Leinster fan you are to be honest. Although, I'm guessing there would be some advantages such as first pick for H Cup games and Ireland internationals. If I were a Leinster fan the only games I wouldn't mind missing are the Connacht games and the games against the Italians.
definitely buy one you get lots of benefits with it for example free entrance into british and irish cup matches and its cheaper in general.