That's quite a nice build. I've always thought about trying it... but I always stick to N/E.
If you've got all the Mesmer skills that cut down MP used, and thigns like double shock, then E/Me is something you don't want to mess with.
I've got a friend on GW who's an E/Me 20, and we were farming the desert on Tyria, and we came across a group of about 6 Hydra. Cheeky little devils they are... anyway he ran, the henchies and I were taken out in a few seconds (those damn -250 meteors), he laughed a bit, then ran in and took all 6 out by himself. Granted, it took him a few minutes of running in, casting the spell, running out, healing, repeat, but it worked perfectly.