Great product. Compact RO without the traditional tank. Easy installation. The pump is quiet when it is in use. The water has good flow. Water tastes good. The only reason i give a 4 is tds result 180ppm when the water first come out. It will drop to 50-80 ppm after 1 min of water running. Still, much better than the traditional RO system.
Update: Intial tds was high as i mentioned earlier..but after a week or two... tds measure can drop as low as 15-20, thats pretty good! Again, need to still purge out water for like 30 sec to get good tds reading if you dont use the filter for a while. Also, water filter will not work if the power is out. But overall i really like this filter and so far the best in terms of size, look and how easy it is to install.