Any Sonos product outside the 100 days, but still within the guarantee period, I would expect the manufacturer or the store to replace it with a refurbished item of the approximate same age and in good cosmetic condition. I personally would not expect a free brand new device, as I would have already had a fair bit of usage out of the original item.
I don't think anyone would complain at that type of situation... but, if I had bought a sub however from Sonos and it was within their 'wonderful' 100 day guarantee period, then I would hope for a brand new replacement from them, or my money back, providing the fault was with the product itself and not as a result of anything I had done to it. (i.e. Dropping the device or placing it next to hot radiator etc.) ..
From personal experience I have found most stores in the UK tend to replace items with new devices in the first month or so and then tend to offer a repair or refurbished item for the remaining product guarantee period, which is usually between 12 months or 3 years depending on the product.
Some more expensive electrical products like large TV etc.can sometimes come with a 5 year manufacturer guarantee or occasionally some of the large stores will often provide their own lengthy guarantee to attract further sales.
Personally I do tend to shop around for a better guarantee period offer, even if that means having to pay a 'little extra' for it, because it brings 'peace of mind' for some of the more expensive items.
