I've thought about it. But, in the past week, I have done T503 and T504. The 505...there's no going back. Right now, I am pleased that this drive also reads the DVD+R and DVD+RW that my Sony DRU-500a burns, as well as the DVD-R and DVD-RW. I fear losing that ability. Yet...Samsung only states that 505 improves readability. OK...but Plextor used specifics to help you judge.