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I have the VF570. I went with VF because they create the most power and have a solid hardware reputation. Sadly my experience with their software side has been much like another member on here's experience. They are *extremely* slow to respond (by that I mean weeks). And we tried going with several versions of their tune and it just wouldn't work so I paid over $1000 for another tune from Frank Smith. From what I've heard ESS is solid on both the hardware and software sides. If I were you and ended up going VF, I wouldn't purchase the tune, just get the hardware and have Frank Smith tune it. Save yourself the headache, time wasted and money. What makes you lean towards ESS?
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