Semi-local Craigs List add has a POD HD500x listed at a good price. It even comes with the travel case. I have a question for all you owners of a HD500x . . . Are there any typical faults or wear points I should look at. I/O ports that just crap out (silly example). The add states "used very little". The picture shows the HD with a small practice amp so I'm betting he "can't get a good sound" out of it and is frustrated with it. Thanks in advance.