I had an 811s for a very short while. On three media brands, CMC, BeAll, & Ritek04 I got bad Kprobe scores and unreadable disks on every DVD-ROM and DVD stand-alone I and my friends have.
I RMA'd that sucker and bought a NEC 2500 and "all" the media, including the CMC, writes fine and is readable on even the pickiest player.
Although Lite-On is well known for thier CD writers being very good for the price, ( I have a couple) thier DVD writers, as far as I'm concerned, are not worth buying.
You end up spending more money trying to find acceptable media that the burner decides it likes than any savings buying the cheaper drive in the first place.
The NEC 2500 actually was cheaper and the write quality is amazing.
You can obviously interpret my recomendation and opinion of Lite-On.