I use many Motorola XPR4550 mobiles for the sole purpose of passing MDC ID along via analog, as it is cheaper than buying a GEnSAC3 Trbo to ASTRO converter for $12k plus. Running a nationwide radio network with half being ASTRO and the other half being Trbo, with some analog interoperability requirements, the XPR4550/5550/5550e is the way to go. Many end users like to press buttons and it is easier to have a non color display and less keys and no menu options to deal with on the control head. Analog sensitivity and selectivity is great. I have found that slightly used XPR4550's work perfect for my use case, and therefore better than spending more on XPR5550e's. As mentioned above XPR5550e's are more sensitive, but most people will not notice the difference. In my case, I would guess there are at least 200 of these being used in analog mode and maybe 50 more in digital only mode......analog is great in the XPR4550 mobile.