Speedy delivery; good prices. Especially like the opportunity to have a screw fitting - the original and subsequent replacements were all push pittings - which I could never remove - necessitating a small amount of plastic pipe (or hose) being cut off each time I had to replace filter. Now with a screw fitting I expect to be able to fit far more easily and without cutting the pipe/hose. Unsure how effective they actually are efficacy wise - but neither was I sure on how the well the originals worked as results of filtered water / unfiltered are hard to distinguish for the layman. These new ones (have only tried one so far) did not need much flushing through compared to previous ones which required more flushing to remove traces of carbon stuff.