If I can get one with a 15-20 expected life then yes I'll pay 3-4x more for it. I expect however an ~10 year guarantee and a firm promise that parts will be av

If I can get one with a 15-20 expected life then yes I'll pay 3-4x more for it. I expect however an ~10 year guarantee and a firm promise that parts will be available for a further 10 years (or if possible the full spec for parts is published and new ones can be made from the spec.)