pbn is a stupid exercise and the only people i've seen press the kind of weights stated here are guys that cheat on the exercise ie barely bring the weight down to the back of their head, never mind neck. even with that they coil and contort their body to such an extent that it ends up looking like a retard lifting weights.
the only lifts i'm interested in are verified power lifts or lifts that i've seen (personally/vid). so far i have not seen a legite one and i'm not losing any sleep over it. as i said, stupid exercise.