My buddy runs the Holley HP EFI on a built n/a 440ci resleeved LS2 with T56. It literally fired right up once you enter in the parameters... and it kept learning/fine tuning the more you drive it.
He has paid a few tuners in our area thousands and thousands of dollars to tune it running HP Tuners and the stock GM PCM/ECU over time with its never ending upgrades.... well it runs the best with the Holley and has made the most power (only a few more HP)... but now it also gets better fuel economy.
No more tuners wanting $400+ to tune your car... or a couple hundred if you make small changes.
I'm putting one on my 5.3 turbo setup.
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Project: 1969 Chevelle, alum 5.3, GTS76 turbo, Chiseled Perf A/W intercooler, Holley Dominator EFI, Davis TC, JRi coilovers, 14" brakes, T56 Magnum. CTS-V Recaro seats!
Coffey Fabrication Nashville, TN doing the fabwork! 800rwhp+/25mpg+/9's@150mph goal 
https://lateral-g.net/forums/showthread.php4?t=52976
1993 Mazda FD RX-7, built LS7, T56 Magnum, Holley HP, Davis Tech TC, 8.8" 3.73 Cobra IRS diff, DSS axles, Ohlins coilovers, big brakes.
CCW 18x11 front 315/30/18's and 18x12.5 rear on 335/30/18 RA1's, 2850lbs
10.31@137mph 165mph Shift-Sector 1/2 mile speed
441ci AllPro headed motor and 200lb weigh reduction in the works....
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