OK, I guess some clarifications are in order.
I wouldn't recommend the Samsung because I have heard of some reliability issues with those drives recently. I don't know if they're all bad, but I'd rather stick with a drive known to be reliable.
I wouldn't recommend the ASUS because, AFAIK, its writing quality isn't as good as the Sony, or the LG, I think.
I would recommend the LG because it's fast and it has a solid reputation for reliability and solid construction. I don't remember how good its writing quality is, but I think that it is good.
I would recommend the Sony because it's fast and reliable, and it has solid construction. It's writing quality is good. Its main downside is the "turbo boost" feature, which means that it defaults to operating at 40x, and you have to enable "turbo boost" every time you want to use it at 52x.
BTW, I don't recommend Lite-On exclusively. Lite-On is my personal favorite, but, as you see, I happily use other drives, too.
Edit: Added more info about Sony and LG drives.