I have had this dispenser for about 2 years now, and I could not go back to anything else if I tried.  I use this not only for drinking water, but also for my coffee maker - I no longer have to descale the machine, since there is nothing to descale!  Earlier this year I purchased a 12-pack of filters so I always have one on hand.  I used to use the tester all the time, but now I can tell by taste when the filter needs changing.  It's an excellent product and I would (and do) recommend it to everyone!