On my Liteon iHBS 112 ODD, the user changes left is 5 ( No region selected by the user) Does it mean it will play any region disk? The answer I found is NO.
When I tried to play a multiregion (2,4,5) disk, Windows Media Player said that the current system region is set to 1 and I should set it to 5 to play.
So what turns out is that the vendor has set it to Region 1 leaving 4 vendor resets still available. If it is not a region 1 disk the user has to set the region. ( The ODD was imported from ebay, USA)
Quality does not depend on region code, which only determines whether it plays or not on your system.