I'm referring to just the straight up SKS duckbill type 75 rounder myself. Pretty much junk. Don't know about the AK/SKSD one, different altogether. Also I buy the drum mags for 2 reasons, first cause I can and second if sh!t hits the fan completely I would rather 75 rounds than 5 or 30, thats just me though. Like a wise WW2 legend once said, "In a man to man fight, the winner is he who has 1 more round in his magazine". Erwin Rommel.
Basically hope for the best but prepare for the worst is another good reason. Besides big magazines look cool, lol. The AR 100 rounders makes your gun look like it has a set of balls, bad ass !!!
P.S. Yeah yeah, compensating, I know , I know