This lens was one of the few lens I bought at launch. Luckily, they were bundling a SanDisk 32GB Extreme SD card with it, so it was more attractive and I got to haggle the price lower by asking them to unbundle the card for me. (Cause I got a few Extreme Pro SDs already at that time)
I have to say it was a great buy for me and it is still giving me great experience as a lens cap. When I'm bored or stuck in my photography "career", it is a nice lens to bring when going around the city and countryside. Yes, it is sometimes distracting for not having the "L" quality I'm used to when I bought it, however, its performance still gives me awe for delivering nice images in such a small package. There are some (pin-cushion?) distortion, minute chromatic aberration, and some vignette, but they are really not a problem when you can fix them at post.
I did some images for some of my clients with this lens and most of them were shocked by how a cute little lens have a significant impact on their photos. I would like to share some of them here but I guess I might just be ridiculed for having clients of low standards. Haha.......
Anyway, for now it is the permanent resident on my 10 years old 350D, which I still use cause that is the only personal body I got now. But I was impressed with it on the 7D2 and 70D, and printing sharp photos of up to 8R on the 350D.