I did not get one with the E-P1 as I found that it is not really TTL when used on the E-P1... it tends to over-expose when shooting too close to the subject.
But as it was on offer if purchased with the E-P2 and I was able to get it at way less than the offer price of $99, I bite and got one with the E-P2. No regrets as Olympus must have fixed something in the E-P2 and it no longer over-expose on close-up.