At $13 I'm too much of a CDFreak not to buy one just for fun.
I would choose another LiteOn drive for scanning however, because you won't get meaningful jitter scans or TA scans with drives earlier than 5S.
Not having an 18x/20x Liteon myself, from the scans I've seen so far I'd still prefer a 6S drive for DVD scanning.
All LiteOn DVD burners are a poor choice for CD scanning, however, partly because they only show E31 as C1 and partly because they are too good readers compared to other drives. Your BenQ 16xx drives with the Advanced Disc Quality scanning of CDSpeed 188.8.131.52+ are far more useful CD scanners.