I have been using Aquasana water filter system for several years. Always prompt and on time doing a great job. They even replaced the faucet portion as it started dripping. No questions, just sent a new one. The filters are easy to replace, takes 5 minutes or less.
Pros: Clean taste, Long lasting filter, Durable, Easy to install
I drink five to six 16oz glasses of water each day. Given the quality of the filtered water, it's hard for me to believe I ever drank water straight from an unfiltered tap, and we have darn good unfiltered tap water too. Once you try the filtered water, I doubt you will go back!
Pros: Clean taste, Long lasting filter, Durable, Easy to install
We've replaced these filters probably 6 times now and I've found it to be easily done if you have fairly good hand strength to separate the top from the bottom of each filter housing. I do not know of a way to redesign the filter housing to make this an easier task but someone who is either somewhat frail, arthritic or otherwise hand strength-challenged would have a hard time undoing the canisters.