The word is that there are some..... issues
with these releases. A few reviews have popped up now giving the set only 1 star and saying the upscaling isn't great (the always dubious juddery-picture syndrome). Looks like maybe a cash-in release.
I understand that there might
still be some improvement over the NTSC versions of the DVDs, if those are the ones you've got. But I think it might be best to leave this one alone for now (unless the price drops dramatically).