Multi-piston PIC is valuable time....but there *is* value in multi-turbine SIC, despite what MANY long-term FOs at regionals may claim.

When I was hired into my current job, I was insurable as PIC on our Citation II with something like 2600 hours and roughly 75 hours in type but only because I already had 1300+ jet SIC, the vast majority of which was in the CRJ-200. That meant I didn't have an SOE limitation on my CE-500 type rating once I left SimCom, allowing me to legally be good-to-go once I had the temporary certificate in hand.

FWIW, there have been *lots* of pilots aspiring to enter the 91/135 ranks prior to the Great Recession who went 121 to quickly build time & experience before making the leap into bizav...