Diagnostic Models vs. Computer-Generated Guides

Dr. Shelly asks:

I have been restoring dental implants now for 5 years. I make the surgical guide stents for my surgeon from diagnostic models. I use the information from the panoramic radiograph to help plan where to place the implants, what diameter and what length.

However, I recently took a course where the lecturer said that was below the standard of care for some dental implant cases. He said what we should all be doing now is using a CT scan and a computer- generated guide stent. Am I still in the stone age with my diagnostic models? Should I really be abandoning these methods after 5 years of success? Comments?