I've had my Zerowater Pitcher for a couple of years and it has made a big difference, saving money because I don't have to buy bottled water, but most importantly, helping me to increase the amount of water I drink everyday.  This is a big change for me.  I had been drinking vitamin water which has a lot of sugar in it -- now I drink plain water and nothing else (ok, coffee).  I also bought one for my cousin to help her save money.  It's a great system -- I can always tell when it's time to change the filter - it starts to taste different -- and I use the meter and it's always at 3.  I change the filter early -- it recommends 6.  Great product.