@NeverDie I have two of them and made some applications using PlatformIO IDE. I like the Wio Terminal. The only issue that I experienced until now is that I couldn't get one of my apps, which is repeatedly posting sensor data to Azure Storage Tables, running without hangs for longer time periods. If you can live with the watchdog it is useable.
I didn't try the bluetooth and sd-card functions.
A good thing is that you can easily enable debugging with a little bit soldering and a J-link debugger.