How good is the Precision Devices PD156 driver

[Bull]

a mate is selling 2x scoop bass bins made of inch thick plywood,covered in black rexine[black pvc,with 'crocodile like feel']4 pole speakon sockets,12 gauge of wire,15 inch grilles and clamps and most importantly 2x Precision Devices[PD 156] 600w rms drivers,with 4.5 inch voice coil. All for £200 the lot
How good are the PD156 drivers,is it worth spending £200 on something i don't know how old it is,and could be damaged.
But i think the cabinets alone are worth £200,because they are made of 1 inch thick plywood,but i don't think for that price the plywood is marine baltic-birch.
Also if the drivers are damaged in any way,how much is the recone kit for the PD 156 [pair]
I wonder how the speakers have been treated though,the grilles are a bit rusty and dented,and the cabinets ,although no corner is smashed,the cabinets is full of scrathes and small dents.
I hope the drivers haven't got rusty or stored in damp or wet conditions.I guess a dented grille flakes off the paint,so it goes rusty.
Please could you advice me,whether or not to buy them.
p.s. i can't open them[eg remove the drivers or grille],but my mate allows me to test with music.