I was an Ecowater dealer for 15 years, then decided to drop the franchise to be independant. Ecowater does manufacture quality products, however they do tend to be higher priced just like Culligan, Rainsoft, Kinetico as well as a few other brands. I never carried the 375 Ecowater R.O. because the filters are only available from an Ecowater dealer and are very high priced compared to most R.O filters. I always tried to get the best deal for the customers.
You can get a Watts brand reverse osmosis system for a fraction of the cost model:55V RO TFM 5SV
This is a very good model, and filters are available everywhere an they are cheap.
The most common complaint from homeowners, with reverse osmosis units is water coming from airgap on back of faucet. Just shut water off and blow thru drain to clean debris, also clean drain saddle.
Whenever dealing with water treatment, find a REPUTABLE dealer if you do go that way....there are a lot of rip-offs!