Bob,
I may have missed the point that you are going with a larger cell, I just checked the T-9 cell replacement. The Circupool replacement cells only carry the original OEM warranty. Their new units use a different cell that has 5-7 years pro-rated depending on the model you buy. I bought mine from the Discount Salt Pool Store. I had never done any business with them prior to this but their ratings were high and I was very satisfied with their performance.
Click here to go to the sale page on their website. Here's a clip from the page:
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1-2 years seems very short life and may be explained by the lower salt capacity and/or lack of proper maintenance. How often did you clean the cell and what % capacity/ run-time? Just curious why you're buying the new unit while you have the replacement still running? You can always use liquid chlorine for a week or so while you wait for the new unit after your existing unit fails.
Another thing I like is that Circupool gives DIY'ers the same warranty as a professional installer. Most other brands limit DIY warranties. Jandy reduces it to zero except for valves and valve parts.
I've found pool stores to be very unreliable. Sometimes they have a person in the store that really knows what he's doing and most of the time they don't. You never know which one you're dealing with.
I hope this helps.
Chris