Well one more reason to ditch the TA01B is that it has an ideal eye relief of 1.4" (although usable eye relief is more than this, this is more like the midpoint). Depending on the .308 you are shooting that might be uncomfortably close to your eye. The TA11C gives you an extra inch.
Also keep in mind that the calibration is only good for a carry handle mounted ACOG with a 20" barrel firing M852 ammo (or a flattop mount for the TA11E and TA55). You can change one of those variables and it won't affect the impact much at all; but start changing several and you'll notice the calibration isn't as useful.
In any case, the TA01B would be my last choice of those.