Yep, 1213S has capacity of writing at 16x. But it is so far from quality. Many many PIE/PIF/POF.... Furthermore, early 3S's CAV writing area is weird. BenQ DW1620 shows many giant spikes of PIF at CAV writing area.
"The newer is the better"
I strongly recommend 1673S@1693S or genuine 1693S. 1693S is dramatically improved from early 3S drive (except +/-RW), and has fully capacity of 16x writing when you use TDK003, TTH02, ProdiscF02 or TYG03. (Disappointedly, 16x writing of RICOHJPNR02, ProdiscR04, OPTODISCR016, RITEKR04, MCC004 is still miserable with KS04)