There are cheaper clamps available. You could also go this way: 0.35mm resistor wires as Tag Connect alternative - TC2050
But the v4 has the newest hardware stack and a more powerful esp32, which is easier to program for, as there is a good ecosystem around it. So it is future proof. A custom firmware is easier to implement on that box. A custom bootloader may come in the future. But in-memory patching is not possible on the ESP32. But we may implement it over teddyCloud and ship modified firmware OTA.
The CC3200 based ones were also great, especially for the custom bootloader. But not easy to program for and we won’t work on the CFW for it in the future.