Anyone using these microcontrollers?

[Terry Fox]

There are probably several people on tacos using Arduinos and/or Pis for 
various projects.  Are any of you using Teensy or Blue Pill boards?  They 
are more powerful than the eight-bit Arduinos.  The Teensy boards look 
really nice, but tend to be more expensive.  The "Blue Pill" boards are as 
cheap as $2, and have a much faster processor than an eight-bit Arduino, 
with much more memory and I/O as well.  Both can use the Arduino IDE (with 
some mods).

I have several of each, and am playing with them on various projects.
73, Terry, N4TLF