RE Rip/Burn speed
I've been using 4x for some years now on DVD copying, ripping, and CDs as well. Even with DL DVDs I can't recall the last time I got a coaster instead of an exact dupe.
Although faster has some appeal, 16x vs 4x amounts to what exactly?? 5 minutes more or less on a DVD? Less on a CD.
Time is no big deal for me. Several shots at archiving DL DVDs @ $2+ ea, does.... plus there's that added time then too.