LiteOn's latest LightScribe drive (the LH20A1H) looks pretty good so far. The LiteOns I've had in the past have done well with mediocre media.
I'd ditch the Datatwrite discs though, and buy some quality media. Verbatim are great, and also make LightScribe discs.
I have 2 LS drives and just got a disc printer, but I haven't used any of them yet (in the drives' case, I've used them for burning, but not LS) :o