Coincidentally, my ED9 and ATE-S arrived today, a day after I got my ED Special Edition.
The ED9 was a little disappointing, its got nice punchy bass with lots of clarity but the highs are just too fatiguing for my J-POP music. Swapping out the inserts didn't really help either, although the brass nozzles had amazing sound stage and detail. But recently I'm leaning more towards a warmer sound signature.
The ATE-S (The newer one with improved sound tuning and memory wire) really surprised me. I've heard several say its comparable to the IM50 and some consider it to be a "poor man's SE215" but its really something else. Ive never owned the IM50, but I did use the SE215 for quite a while before I moved onto the CKR9 and CKR10 from AT. I think the ATE-S already beats the SE215 for two reasons - The price, and it does not have as much of high end roll off the SE215 was notorious for, and for me personally that was my biggest gripe with that IEM. The ATE-S is a keeper for me. It turned out to be a lot smaller than I thought and I guess thats a good thing because it sits nicely in your ears. The Audio-Technica IM50 and IM70 was too painful for me to wear. The sound stage on the ATE-S was also pleasant, if my ears aren't deceiving me I'd say they are slightly wider than the SE215. If anyone is considering an entry level over the ear IEM for casual listening, monitoring, or someone just getting into the audiophile market, I'd check out the KZ ATE-S.