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I have 04 Tahoe and I have the Hypertech programmer. It does work. The shift points made a differnce for me. Now I will say it is not a drastic change. I actually noticed it more when I set truck back to stock and see what it is missing. I intend to get and recommend a true custom tune if you really want to get something out of it. But for what it is it's okay. Plus I got a steal of a deal for mine on craigslist. That is why i picked it up.
Good luck
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What about BlackBear? From what I've read this is the way to go.
I had used hypertech and it didnt do anything for me. didnt notice and performance changes, mpg, or even changing shift points. I returned it for a refund and Went and tried Black bear Autocal tune. There is so many good things about the autocal. One thing is that the unit can hold mutiple tunes that can be swapped out and programmed into your truck at any given time. I got tunes for towning, sport mode, 87 gas, 93 gas, tunes for 22 inch rims and 17 inch rims. The best for your money compared to any Chip or programmer