"certified pre-owned"
who owned it? if it was in a fitness center, it may have a crap ton of miles on it already.
What's the warranty? Did you say 2 years? That doesn't sound like much. Do they have a local repair person where you live or is getting it repaired going to be nearly impossible?
If it's me, I'm getting a new Precor or Landice, and from a local dealer where if I have problems I know who I can call. My local dealer automatically extended my Precor warranty to 10 years.
If you haven't had a chance to run on a Woodway, you should before plopping down 5k. Not everyone likes that soft belt. If that's not an option for you, you're really taking a chance. I can't imagine that'd be an easy return.