Tätsächlich works pretty well. If you have the unit installed (which SATA-typical easy going of the hand), for example, Nero displays an extra icon next LightScribe, which allows you to label the media.
The media for Labelflash but are extremely rare. I had to let me which import from Isreal.
To label a Labelflash page takes about as long as with LightScribe, ie 30 mins. The contrast is OK, but is probably also on the blanks.
The instrument itself is very reliable, but the quickest (although the difference is practically marginal) not when reading data.
There is, for example, compared to my LG BluRay burner relatively quiet. I've had no problems with the device when reading media, what with all the drives is not always self-evident.
Conclusion: Rock-solid burner which also Labelflash can.