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Having said that, Sony, Philips and other firms will use top quality components in their players while others will use cheap taiwan stuff that comes in bulk from a factory they may never have visited, and all the company do is put the things together and write the firmware. It's the same difference(?) with computers, go to most mail order bulk resellers or some companies, and they will offer you a cheap computer with better specs than all the others. Go to a more reputable dealer, like Special Reserve, PC world or anyone like that and you will find the prices slighty higher, but the components are a better quality and are often badged.
In the end, you choose what suits you. If you're happy gambling with unbadged components and lack of after-sales support, then you don't have to pay much to get a good spec DVD player, but if you want the peace of mind over the technical options then you go for a good name and pay a bit more. That's the way I see it anyway!