It sounds like many of the complaints in this thread are due to a misunderstanding of how Japanese sellers list and grade their items. Let me translate, based on what I've found...
[Japanese eBay listing] [My interpretation]
Good --> Very poor and almost always in need of some repair.
Very good --> Just 'okay'. Consider only if you are prepared to repair/service
Excellent --> Often heavily marked, maybe a crack, but usually fully functional
Excellent+ --> Fully working, but obviously heavily used
Excellent++ --> Fully working, some obvious signs of use
Excellent++++ --> Fully working, minor signs of use
Excellent++++++ --> Fully working, very clean
Near mint/top mint/rare mint/mega-mint etc. --> Fully working, almost perfect (factoring in the age)
Mint/Mint (add multiple pluses here) --> Fully working, almost no signs of use
Unused/New --> Unused/New
The above isn't the gospel, but you get the idea...and yes, I may have missed a few '++++'...some listings become ridiculous!
The bottom line is: if you want a clean piece of equipment, look for something listed as Excellent++++ or above and check the photos and description carefully.
In my experience, Japanese eBay sellers are extremely honest, provide great service and are very easy to deal with.