Filter works great for the first few months, but then as it gets older, it gets quite slow.  Lasts six months, but could replace after 3-4. 

Shipping instructions/notifications could also be improved. After ordering, the email received says "Your order will arrive within the next few weeks. You will receive another email with tracking information once it is available". I didn't receive an email with tracking and it arrived randomly a few weeks later. [This review was collected as part of a promotion.]