The Edge is nice because it has the gauges and built in safety features.
The new Bully Dog PMT also has gauges and built in safety features but it is technically in beta form right now. It is also internet upgradeable which is great and puts out more HP than the Edge.
Downloaders like the Superchips are nice but lack adjustability on the fly.
If you are looking to improve your mileage, the MP-8 is probably your best bet. Most people generally gain 2-3mpg.
You will definitely notice a difference on your truck.
-08 MC/68RFE 4x4- Built by: Me, H&S, & Shibby Engineering
-09 QC/G56 4x4- Built by: Me, H&S, & Shibby Engineering