Originally founded in 1853 as a wagon factory in Switzerland, by 1865 they were supplying rifles to the Swiss Army and the company's name was changed to Schweizerische Industrie-Gesellschaft (SIG). In the 1970's SIG formed a partnership with J.P. Sauer & Sohn, GmbH of W. Germany, hence the SIG Sauer name. SIG SAUER has its U.S. headquarters in Exeter, New Hampshire, with over 280 employees.
Source: SIG SAUER website
Slide not likely to rupture and break operator's jaw (like Beretta model 92s) or suffer severe Case Neck Blowouts (like so many cheap Glocks do).
Popular for their "To hell and Back" reliability.