They are good units. When i worked at edge the ford calibrator was very good tuner. They currently still use his stuff. If you want something or need any ford,chevy, dodge diesel custom tuning let me know i can either Build you what you need or point you in the best direction.
You'll be happier with a PHP tuner ( the same guy that does the tunes for Edge ), and a Edge Insight CTS for monitoring.. http://www.powerhungryperformance.com/ Check out the forum's their website leaves a bit to be desired..
The reason why is none of the Edge stuff will change the shifting stragey for the trans ( disregard if you have a manual ).. If you complain about the way it shifts now, mostly when towing ( shifting into OD at 45 MPH for example. A lot of guys bitch about the 4R100, it's the tuning on them that sucks, get that straightend out and they are a great trans. ), you will really bitch once it has some power. Seriously, check out PHP, you'll pay more, but you'll be way happier..
I ran a Evo for yrs, they do just fine. I'm a Edge dealer actually, and I wont recommend one for a guy that runs a auto trans in a 7.3..
i got a ts chip 2 months old that i just took out of my 01 ford 7.3 with an auto if anyones interested. worked great, but it didnt change the shift points that i needed hauling 20-25k everyday. i bought a dp tuner chip. jodi is the man when it comes to these 7.3's!