I purchased this as a replacement for the previous model. That previous model lasted 17 years in a family of 4. In my mind that is a great return on investment. The new product could have simply connected to the older drain basket but I did chose to install the new drain basket. The drain pipe connection is a new design but in the same location which allowed me to install with no plumbing changes. The product comes with an enzyme bottle and is the same one from the former model so I can use the ones I already have. In general the product is great and installation is simple if you are handy.