Just for informational purposes here...
I (finally) found and downloaded the Raph radio 1.17.25.09 on my device after being fed up with the GPS issues I was having with radio 1.14.25.35 (lock times widely fluctuated). I already had the ril for 1.14.25.35 installed.
Having the 1.14 radio flashed I would drop into Edge mode a lot around the city and surrounding areas. GPS lock times fluctuated widely (anywhere from 15 seconds to 45 minutes) and rendered its reliability to that of a paperweight.
Since flashing 1.17 I have not dropped into Edge mode a single time. I am seeing a greater signal strength across the board in all areas that I am normally traveling. GPS lock times are all within 10-15 seconds, cold, warm, or hot boot. Hot boots can expect a 5-10 second lock. Wi-Fi and Bluetooth connectivity remain unchanged and there is no noticeable difference between their performance between 1.14 and 1.17.
However, there is a difference in the Raphael 1.14.25.35 ril and the Diamond 1.15.25.14 ril. Performance is the same in all categories between the two except in battery life. I am guessing about a 30% less drain (the percentage could be more or slightly less) on the battery with the Diamond 1.15 ril installed.
Call quality may have changed, I don't know. I haven't really listened for that.

But there is no echo present, I can hear callers perfectly clearly and they can hear me perfectly clearly. No call drops. It feels as if everything just got better.
For reference I have an HT850K Raph and I reside in the New Orleans AT&T market. I am going to evaluate this throughout the next few days as battery life will settle into its normal cycle.
Edit:
I tested the 1.15 ril for another day but the battery life suddenly decreased dramatically. If I didn't place one call or use the Wi-Fi / Bluetooth, from the moment I woke up with a fully charged battery, I'd go to sleep that night with the phone at about 60% battery power remaining. I uninstalled that ril and reinstalled the 1.14 ril and have seen much better results over the last few days. I am at 97% battery life and the phone has been off the charger since I woke up. I have not used the phone, Wi-Fi or Bluetooth at all. 1.17 radio with the 1.14 ril is a good combination for my area.