I plan to do the Whistler Legacy DMR Upgrade $59.99 with Whistler support moving forward. I don't see investing in a top of the line Uniden scanner ($700) that basically does simulcast better than the pro-668 but that's about it and the 668 does pretty darn good with simulcast anyway and P25 Phase 1 and 2 with DMR on the upgrade. These used Radio Shack 668s are still very capable with where the technology is today and who knows how this encryption stuff will play out.A firmware upgrade has nothing to do with front end sensitivity. The only way to make a receiver hotter is with hardware changes and that would mean sending in the scanner to Whistler and a price much higher than $60. No need to justify your spending ,$60 is very reasonable to update an otherwise outdated scanner