I bought my DW1620 bulk in Dec 2004 and crossflashed it to a retail pro. Have been using latest B7U9 firmware with no problems and burnt about 50 Dvd's without one coaster. In the last few days, it has been slowing down to 4X speed maximum burning with poor quality scans and eventually, it stopped recognising blank dvdr's. Now, when I insert a cd or dvd, it just makes a clicking noise while the led blinks, then the led goes out but it doesn't recognise the disks. Have now flashed it back to a bulk drive so that I can hopefully return it under warranty for a replacement. If I have the choice, I will exchange it for a different make due to the current quality control problems.