I've been a fly along mechanic on GIII aircraft for various companies. I would go along on the overseas trips. Bottom line, they are truly fantastic aircraft. The later model GIII's (AC GIII) have many of the same systems as the absolutely stellar Gulfstream GIV. Including flight control components, variable frequency generators and electrical converters. They are very well designed and refined over the years with an active program of "customer (service) bulletins" to address common issues.