Skidril produces three hydraulic post drivers that are of good quality according to Skidril.com. Kencove, Kiwi, and Vector are other brands recommended and sold by PostDriver.com.
The Skidril hydraulic post drivers are lightweight and need only a 7hp power pack to run. These models can be hand held, while others are based on tractors, mini excavators and skid loaders and are good for smaller projects. The Skidril models are available with multiple heads and male or female anvils. These have the ability to drive square, round and u-channel posts as well as stakes. Skidril post drivers are low noise, and there is no exhaust from these products, which range in price from $1,500 to just over $2,500.
Kiwi produces post drivers that are able to be mounted to the chassis of a 1-ton truck and are available at PostDriver.com. There are 12 hydraulic post drivers sold on this site, which also sells drivers that are used with tractors, excavators and skid loaders. The prices for hydraulic post drivers on this site range from just under $1,900 up to over $32,000. These post drivers are recommended for use on farms as well as for professional contractors. The Vector models sold on this site are virtually indestructible and maintenance free.