Bought this to replace an 18 year old softener of a different brand that quit working.  In looking at the controls and mechanisms, this appears to be almost an exact copy.  No problems getting home and unpacked.  It set up quite easily and went exactly where the old one was.  It is a couple of inches deeper, but that is no problem.  Plumbing was identical.  Turned it on and its been working fine for a couple of months now.