If you really want/need one NOW, there is nothing worth to wait. Buy whatever that is in the market. New technology will come along and make you wait again and again. By March, 16x burner will be 3-4 months away. The wait will never end.
Here is a good news, as somebody mentioned:
You don't have to wait!!
Actually, i always buy high-tech stuffs from a place with good return policy. One thing about review is that even if it praised the product, it does not mean that the product is right for you, and vice versa. Following web review like a blind man is becoming phenomenon i really hate seeing the most these days.
It is your money, if it works for you and you are happy about it, why bother that reviews are not good. Reviews might say drivability of Honda maybe better than Toyota, better rides and so on. But if you are not happy with Honda when you test drive, why should you buy one! Of course, i'm not saying that not to trust reviews, but take those with grain of salt. Your satisfaction is more important.
LiteOn is in business on making CD DVD drive for long time, they should know a thing or two on making good quality product. True, 401/411/811 (all same hardware) may came out a bit in a rush, because they were far behind other manufactures like Pioneer/Sony at that time. But 812s should be as good, if not better than 811s by judging history of their CD burners history and different generations.)
If you already have a 8x burner, then there is no point for gettign 812s. At least for me i won't care about writing 8x DVD-R, as I can write +R at 8x and happy about it. Btw, DVD-R does not need changing booktype. Many older DVD players are predate +R, that's why makers of burner may put this feature to help compatibility. There is no significant proof that +R with ROM booktype is more compatible than -R.