Welcome to the neighborhood.
Honestly, I have never heard of them. If they are cheap, that is a good reason NOT to use them. Using just any "chip" could hurt you more than help you. Also, don't believe all of the claims of added horsepower, many of them are over stating their abilities.
If you are looking for good quality tuning that will be safer to run for your truck, I personally would choose either a Black Bear tuning EFI Live tune set up, OR something like a Hypertech.