Yes, they are priced like an A kited Vulture. Try to buy two of them and mount them to your Python. And you will see...
As I already mentioned in some other thread. It is like to have one A kited Vulture in left hip holster and second A kited Vulture in your right hip holster. Do not belive that those turetted beams are useless. It is simply not true in 1.3.
I have them for a long time on my armored Python trader and with 4 pips in weapons, they cook everything less than Dropship in less than a minute. And you do not need to turn your Python at all. Just target and fire, even if the target is at your six.
P.S. The only thing I am missing is the possibility to target them idependetly on two targets of Wing.
"Fire at will" ought to do that once in a blue moon. I'm not sure you would want it though, as killing one fast, then moving to the next seems to be a better tactic.