Forum:ME2 insanity save data affect on ME3

Evening!

Does anyone what exactly you get in ME3 for having an insanity play-through save file from ME2?

Here is my situation: Huge fan of the series and I've played both the previous games extensively. I have an insanity save on ME2 that is just prior to the final encounter. Should I complete it prior to picking up ME3?

Just looking for some guidance from people that have imported ME2 insanity completion over to their ME3 game. With the Mass Effect 3's release I'm having a hard time finding the motivation to load up the old game and finish it.

Thanks!

David