I also like the fact the ECU can control various areas, ie kill AC compressor at WOT, adjust for cold/hot temps, adjust for ambient air temp, spark timing, and so on. No matter how good of a carb you have, it cannot compare to the EFI advantages. I hated the stinky smell of a pig-rich holley, to me it's worth spending 4k on not smelling like that.
I'm pretty much sold on this kit, I just need to figure out how long it would take me to get it installed and running