Picked them up today, and unless the official Asian releases are genuinly only single layered, they look like pressed rather than burned bootleg copies - only 4.35 gig instead of 7.39 (compared the Best of Both Worlds UK R2 original with the Asian copy). DD 5.1 etc so were probably copied directly from an original disk unless, like I mentioned, the Asian releases are only single layered - they look identical with all the menus etc. Some R3 disks are single layer or letterbox instead of dual or ananmorphic like their Western counterparts for instance.
On the tv I can't say there's a lot of difference, so if you're after the complete set then it's not a bad price at £12.86 a season all in. If you can find a UK supply with cheaper postage (mine were shipped direct from China), then better still. The quality difference may be more noticable on a projector set-up though - I'll try mine at some time and see how they look.
I'm quite happy with them, but some are selling for £20+ a season, with complete sets going for considerably more, so look around. Not as cheap as getting a mate to 'make you a back-up', but being pressed, are more likely to play on any DVD player - I'll try them on my old Samsung 709 which is very picky and only plays +RW burnt disks (as well as pressed disks).
Bottom line though - these are single layer disks and possibly bootlegs, so beware when buying if you want the dual layer versions.
HTH
Gary.