What do you mean by 3 sides good ? helical heads have square carbide cutters in a spiral some are 3 row some 4-5 or 6 as this pix shows, is he suggesting the carbides are dull and toast ? or is he suggesting the head has 3 sides that can hold the carbides and some of the others cannot ? get that clarified.
Generally speaking, if the table is straight and level without damage and all the parts are there and the bearings look in good shape ..... and the motor doesn't look like it has be beaten to death then, I would think 600.00 is a decent deal Remember, for 1100-1,250.00 you can get a decent combo planer joiner, just depends on what you need and how robust of a machine you need.