Good question, Mike. AFAIK is should be pretty accurate; I don't recall anyone really trashing them over it. Some years ago MMiR did a side-by-side of the Academy and original DML kits. While both had their problems, general shape accuracy of the turret wasn't perceived to be a concern. I have both early and Premium DML kits and the Academy one, as well as several resin and plastic T23 standard turrets from DML, Italeri, Tank Workhsop, and the like. Accounting for known variances in T23 shapes from different foundries, my own opinion (worth at most $.02) is that the DML M51 turret doesn't have any glaring accuracy problems.
Greg