I purchased an Osmio EZFITPR-O300 and have juts installed it. It took a while to arrange the recommended bypass pipework and valving. Also the filters only just fit in the cabinet under my sink height wise, allowing for filter replacement and to get a screwdriver in at the top for air bleeding (I have a Belfast sink unit). Installation instructions (once found) on-line easy to follow. It would be good to include these with the product. These instructions don't fully align with wording supplied with filters or what is said on YouTube channel. It would be good to get everything aligned. I also think it would be easy to get filters in the wrong way round, so some clearer marking on that would be helpful. Finally I would say something about recommended clearance above and below the unit before installing (for screwdriver and filter replacement). Overall I'm very pleased with the product so far. The flow rate looks acceptable and the water tastes nice and clean.