we offer a 1 year warranty
no matter what the manufacturer says, when they are rough on it 2 years from now, the manufacturer will do the old "installers fault" and not cover anything at all - we feel if it is going to fail based on something we did, it will happen in the first 2-3 months
be realistic in the expectations, inform them they can run 10 ads in 10 days in the news paper and pay $300 for a half page ad (check local listings), or pay 3 grand (same amount) for something that is around for 3-4 years with proper care
education is the key