My 2 ac. pond was built in '05 and the builder did not use a sheepsfoot roller and it has leaked ever since. I spent a fortune trying to fix it with no luck, Finally gave up, drained the pond and am relining with new clay and bentonite.
As soon as I finish typing this I am going to call another rental place for a quote on renting a 12 ton sheepsfoot roller. One quote was for $2400 for 30 days delivered and picked up.
I would NEVER build another pond without using one. Trust me, the cost is well worth it if you have poor soils.