By the time a PLB is 5 years old and needs a battery change, it is technologically outdated anyway. That was certainly true when I was three years into my first PLB--the McMurdo was half the weight, so I got it and donated the first PLB (ACR) to a Scout troop.

As mentioned, I'm considering the DeLorme if I can convince my son #3 to subsidize it since I take his kids out several times a year. I still have 2 years on the McMurdo battery, so there is no rush!

While the DeLorme doesn't yet do what I predicted, do a song and dance routine to keep us entertained while waiting for rescue, the 2-way communication with SAR (so SAR knows what to expect and you know they're coming!) is a far more useful technological advance!