What's the difference between the Uniden R7, R8, and R8W?

Across enthusiast reviews and the r/radardetectors community, the R7 is treated as the long-standing dual-antenna value flagship with directional arrows. The R8 adds updated hardware, and the newer R8W layers on Wi-Fi, Bluetooth, the R/TACH app, and further range improvements. Reviewers note the gains over the R7 are real but incremental, and not everyone feels the price jump is justified.