I’m another temperpeadic pillow user. We got two free when we bought the mattress and then a handful of years later we bought two more. We’re almost 9 years into the first two pillows and they don’t show any sign of degradation. I can’t imagine using anything else.
For our guest bed or the kids bed we bought generic memory foam pillows they aren’t as nice as the name brand but kids are durable and the guest pillows only get used for a week at a time so they aren’t worth the money.
New pillows every 2 years seems crazy. Wash you pillow case and as long as you feel good when you wake up what more could you ask for? Eventually we’ll need a new mattress and when we do we’ll probably replace the pillows too as it is I miss my bed more then I miss my wife and kids when I go on business trips.