With the exception of the PMO EFI I setup I've had all the others on my engine.
BITZ - not enough power for my engine, as mentioned above needs a newer MS unit with deeper maps and a TPS would be nice.
Webers - power but a pain in my rear in the cold colorado weather
CIS - Predictable, never fails to start hot or cold. Plenty of adjustment available to make great power on my modded engine. The parts while NLA can all currently be sourced as "rebuilt" or you can repair them yourself.
YouTube - 1980 911 SC Tbitz EFI on a new motor
Thats my BITZ dyno run, you can see my webers running as well under my video. Somewhere in PP my dyno sheets are posted as well.