I am on my second one - the first was left on a bench somewhere in SoCal after changing it. The darned thing is so small it is easy to overlook. Despite being molto cheepo I actually bought a second one since it is such a great lens. You are going to have fun, but beware because it is pretty wide for a long lenser like you and takes some getting used to. Especially if you try some of those lovely portraits up close, and it goes really close.
The new distortion filter in PSCS2 gets rid of the barreling you will sometimes see - or you could try one of the Panotools GUI's - they are excellent.