This is older information but:
Per wikipedia, "The SIG-Sauer P229 in .357 SIG is currently the standard issue firearm carried by agents of the United States Secret Service, the Bastrop County Texas Sheriff's Office, the North Carolina State Highway Patrol, Delaware State Police, Alameda County Sheriff's Office, Virginia State Police, Federal Air Marshals and the Treasury Inspector General for Tax Administration. In most cases, it has replaced 10 mm, .40 S&W and 9 mm loads. In 1995, the Texas Department of Public Safety became the first government agency to implement the .357 SIG. The Tennessee Highway Patrol presently issues the Glock 31 pistol chambered in .357 SIG. The Canadian Forces Special Operations unit Joint Task Force 2 reportedly uses P226's chambered in .357 SIG, as well as Canadian Naval Boarding Parties who use P225's in .357 SIG. The Bedford Heights Police Department (OH) currently issues the Glock 31/32 in .357 SIG."
From what I have read everyone that uses the 357 Sig really likes it.
I have not tried it since I usually practice with what my employer issues.