I've been using RecordNow Max 4.5 from Stomp, Inc. for quite some time now. I recently replaced my old Pioneer A07 with a LiteOn 451S and have had no probems.
I've also flashed it with the 851S GSOH firmware and it runs great. So far...I've gotten good 8x burns on 4xDVD+R by Memorex (CMC MAG F01), TDK (RICOHJPNR01), and Sony (RICOHJPNR01).
Not bad considering I paid less than 80$ for this drive.