This lens is meant to be used on a full mold makers, and a need to ensure that fact to find the intrinsic value of this loophole.
On an APS-C camera so the options are many and above all better, but if you want this wide angle with the brightness of a full shape launcher so the choices are not so many anymore. We're talking heavy zoom from third party manufacturers or DYR zoom from Canon (over 10 cardboard).
This is a good compromise if you do not prioritize wind angle is very high. In addition, convenient to take with, it is easy and fairly compact. The image quality is not top-notch, but it is absolutely acceptable and it does what it should.
So take it into account as the one I wrote earlier, this is still a good and sensible objective.