I'm looking at purchasing a used Edge EZ for my 2002 HO 6 spd. and was just wondering ... ..... is there a downside to buying used? Do they wear out or is it like a light bulb ~ It either works or doesn't? I also noticed that they are advertized that they came off of a 2001 or 2002 etc. Would a 2001 work on my truck or should I strictly stay with my year? Thanks ~~~ Cliff