Product review (5 stars): Have purchased 2 of these for my home. Slightly ...
Have purchased 2 of these for my home.  Slightly cheaper than in store.  Considered the off brand ones but several reviews mentioned slow leaks or odd taste.  Since I only have to change this every 9-12 months it seems more worth it to spend the extra $17 and get one I know has neither of those issues.  Just ensure you order the correct one - several look similar in online photos.