The original valve assembly lasted about 4 years, which is not too bad, I think. It was difficult to figure out how to remove the old part (recommend that instructions are included when you buy this replacement part) and required some force. Otherwise, we are very happy so far with the replacement.

We've owned the filter for which we needed this part for several years and been very happy. One of the knobs on the original diverter assembly started coming off and eventually the threads stripped. For what it is, this part is pretty pricey (hence 4 starts, not 5), but we didn't want or need to replace the whole filter. Detaching the old oneassembly proved somewhat difficult, and couldn't have been done by someone with little strength. Installing the new one after that was a breeze. Overall, we quite like the filter and its once-a-year replacemtn process, enough that I recommended a more substantial model at my workplace. I've also been very happy with the retailer, BestFilters.