PLS oversees the standard but test only what is sent to them. it is not uncommon for a company to send a unit in that does not really reflect what will actually be sold to consumers.
it is also not uncommon for junk units to put the label on even though they did not send a unit in for testing. this is common in the asian market and south america. this is why i say the sticker is pretty much meaningless as to the overall quality of a unit. especially when looking at cheap junk units that may be faking the sticker.
only a good review that takes it apart to see what components are used and tests every aspect of how it handles is worth using when considering what to buy.
i'm not saying there is no difference between the levels. if it...