The folks at QuickRig have some neat stuff, as you’ve noticed further up the page with their offset hook rigs.  They also make a couple very nice series of snap swivels.  They all feature ball bearings, are made in Japan (not China…).  They run a wide range of sizes to fit most applications.  They make both a tournament style rig and also a corkscrew connector.  Both are very well constructed, and reliable.