I'm old enough to know my way around a Holley carburetor but didn't like the constant fiddling so I was an early adopter of the FiTech TBI. I went through 3 TBI units and 2 wiring harnesses under warranty before I sold it to a forum member for $100. FiTech is still in business so I would have to assume improvements have been made. I currently run the Pro-Flo 4 that was flawless for two years until it wasn't. This summer the Edelbrock return rail mounted fuel pressure regulator failed and a direct replacement being backordered indefinitely I had to convert over to a external firewall mounted unit. In that process I must have moved the PF4 distributor extension harness connector onto the top of the fuel pressure sender unit. The end result was me bringing the trailer to the car after it stopped running at 2 autocross events. The car ran perfect until it got heat build up and then wouldn't run until it had cooled for hours. After a lot of cursing and hair pulling moving the distributor extension harness connector an inch off of the top of the fuel pressure sending unit made the car 100% awesome again! Multi port fuel injection is the best thing on earth when it works, and a head scratcher hair puller when it doesn't. Given the G forces of autocross I'm going continue on with multi port EFI for now.