They're expensive, but few tools will do what they do. I just finished a pile driving job with 36" dia., 1" wall pipe piles. The fabrication to be attached to the heads required that the pile tops be round. Rather than buy the right tools from Mathey, the contractor attempted to use come-alongs, hammers, long pry bars - and more than blew what the right tools would have cost on his labor. In the end, the contractor had to request the top connection be re-engineered (at his cost) so the thing would work.
Bob Garner