Holley MPFI

[IndyNova]

Hi guys, looking at the Holley mpfi 550-609 engine control unit. Wondering if anyone has used this before? I will be using it to control my 6.0/80E 69 Nova. I debated on going with hp tuners, or using a well known tuner here in Indy, and I came to the conclusion the Holley would be best for me. I plan to make many mods as I go, and can't afford to pay a tuner for a retune after every change. I know the unit says its good for up to 600-which according to Holley is only based on their injector control capabilities, but they said I could lap top tune if I wanted to. SO, having said that, what are your opinions? Thanks