only going on my 2nd year but based on diagnostics from IntelliWand and from disassembly and looking at the cell plates (they look identical to brand new cell), my guess is that I will get somewhere between 3-5 years from this unit.
it does help to have the Simpool inject small quantity of diluted acid into the line, just prior to the IC40 cell while the system runs a cleaning schedule, current schedule is 14 hours/day and 3 days/week with IntelliFlow running 24 hours/day at 95 watts (IntelliChlor is automatically turned off at power use below 125 watts).