I purchased the three horse power (twenty ton) electric model back in February of this year. The machine is advertised a being quiet, but actually is very loud with a high pitch noise that requires ear protection. Doug (company owner) says it is due to the higher RPM of the three horse power model and the hydraulic pump is making the screaming noise. Doug says he will send me a quiet pump. Doug has said this for months now. I call Ramsplitter about every two weeks and Doug says he will send a new pump each time I call but it never happens. Also Doug doesnt think that he needs to change his quiet advertisement as only two people (according to him) have complained.