I'm not sure there is really answer to the 1500 hour question. In our corporate flight operation we have stringent insurance requirements. Personally, I've flown with excellent pilots with only 800 hours and conversely flown with crappy pilots (IMO) with 2500 hours. Personally, I would love to hire one or two "junior" pilots with 1200 hours and let them build time. Unfortunately, for right or for wrong, the insurance company has the last say (mostly).