The guys at CD Freaks have put together a review of LG's 18x "Super Multi" drive, the GSA-H22N. Here's a sample of what they had to say:
The LG GSA-H22N is a Super Multi DVD burner supporting nine types of DVD and CD media: DVD+R/RW/DL, DVD-R/RW/DL, DVD-RAM, and CD-R/RW.

High-speed 16x and 18x DVD+R and DVD-R writing works very well and produces discs of very good quality, in record time.

48x CD-R writing is equally fast, with very good disc quality as well.
We too have a review of the GSA-H22N in the works. Unfortunately, our test unit refuses to work at UDMA Mode 4, which has caused some problems when writing at 18x. If you'd like to read more, CD Freaks entire review can be found here.