PCMforless
from what i know tons of people have gone with pcmforless. i did a poll a while back seeing if people went with pcmforless or with madz28(another custom tuner who frequently comes up). the poll was just about dead even showing that they both do amazing work. i personally went with pcmforless
Theres two things that beat pcm4less or madz28. Dyno tuning with a wideband. or tuning yourself with lots of datalogging and a wideband. both of which are costly. Dyno tuning you could easily spend 500$ on and thats if you get a good deal. Tuning yourself you're looking at 460$ minimum for all the equipment and software you'd need. Then you'd have to know how to tune it. 175$ for a pcm4less tune is a great deal. and since they do so many mail-order tunes they are usually spot-on unless you have a custom cam.
I wouldn't call pcmforless or madz28's tunes "guesswork" It's more like they have tuned cars for that long that they can almost get it that spot on without the dyno. Granted it is not comparable to a dyno tune, but it's a lot cheaper, and is def. worth the money. If you have bolt-ons or a very mild cam, I would suggest a mail order tune. anything above that I would get a mail order tune to drive it around on, and then get it dyno'd.
Bryan Herter at pcmforless has been doing my turning for about three years now and he does an outstanding job. His tuning "is not" guess work, it is based "sound" performance baselines and experience from LT engine dyno testing. I believe some of that dyno testing was with Chad Golen. And, I'm sure Ion also does outstanding tuning based on what I've heard.
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