[Aloha]

Sorry for the late reply.

NV in my region gave a many fold improvement on data performance, voice performance came later (when the NV network launched here - even when done on 80% of the sites - there were still huge dropped call issues, because of the inability to handover between legacy and NV, and because of a lack of meaningful optimizations on the new network)

If you were deployment in 2012 - you must be in Chicago since that was the launch market - Chicago had more problems then the next 4 NV markets combined, huge build quality issues, most of which have been resolved now.

Even then - with NV you didnt see real improvement in most areas until the launch was complete, which took a hell of a long time - 2ish years for Seattle, longer elsewhere.

NV for those not in the know was an forklift upgrade of the sprint network, and involved wholesale replacement of everything from the Antennas to the Switch.