Summary: I wanted this lens because it duplicates the "normal" lens for 35mm photography. Unless it breaks or I lose it, I will not buy another one. Other lenses by other manufacturers in this approximate focal length are formulated as wide angle lenses.
Summary: Even though is a small lens it works great. You can take advantage of the DOF in your photos, and create beautiful images (portrait or landscapes). In my case, it's a second hand lens, handled with care so I got myself a very nice cost-benefit deal.
Summary: In short: decent lens, decent price, fun to use, not for everyone. Let me get my technical observations out of the way first. It's very small and light, and very easy to wield. I'd avoid this lens if you only had an E-3, but on any other model is a welcome change from using a big zoom. It comes with a screw-on lens cap. It's very thin and looks nice, but kind of a pain to deal with unless you leave it off most of the time.
Pros: size/weight, good and consistent IQ; but see weaknesses, versatile and useful focal length as a prime
Cons: chromatic aberration performance, screw-on lens cap is not practical