Mine's a manual with the 5.7, it absolutely was worthwhile for me. I set mine up to control electric fans right off the bat, then started tuning. Given that yours is a 98, HPTuners actually supports your PCM, but the 0411 has many more things to mess with in tuning. I did the swap in a little under an hour, granted my PCM was pre-tuned (basic) for this truck when I got it. The only one problem is, if you're used to seeing the shift indicator light, forget it because the 0411 won't run it directly. That's it. I wouldn't go back to the stock PCM for anything now.