luckydriver wrote:So which sears to buy?
Respecting your decision I would buy at a local Sears, rather than online, and have the salesperson make the softener capacity determination.
That way, you may have recourse if it doesn't soften properly.
If you choose the softener capacity and it doesn't soften properly you'll have no recourse.
I'd check the warranty fine print very carefully regarding labor and whether on-site service calls are covered under the warranty and what their response times are... IE, hours, days, or weeks.
A Sears softener can definitely soften but it will not soften indefinitely.