here are some sample burn comparisions between the DW1620 B7W9 and the 1655 BCDB.
Fuji 8x media (YudenT02) burned at maximum speed on both drives.
First scan is 12x burn on the 1655 with SB on OS on WOPC on
Second scan is 16x burn on the 1620 WOPC on
both very good burns seems Solidburn is restricting the Overspeed to 12x on the 1655 wish there was a way to turn that off and still use overspeed!