Only thing we did not like is the plastic to metal connection on the in and out, would be nice to have metal threads for a very solid and secure connection.  Now I guess I need replacement filters, would have have thought at least one replacement would have come with the system.  Did not even need the installtion kit, it got thrown out by the plumber. 
 Otherwise, easy online purchase, excellent ontime delivery, very solid and well made system, fairly straight forward to install by a professional plumber.