A year ago bought a Discovery VL it is very interesting thing and does not cost so much.
But it is not very convenient to use it in “Breadboard” as it has a number of medium contacts that prevent paste it into Breadboard.
So people sometimes doingl so.
But I do not like this variant it is quite bulky and also so many pins as in TFQP64 are not always needed.
So I designed my own Discovery mini))))
Made by this technologies http://www.diygoodies.org.ua/?p=289
Built on on the controller STM32F100C8T6B TQFP48 on board is the: Linear stabilizer, 8MHz quartz, 32kHz quartz, a status LED. External contacts are formed in a position DIP40 which is very convenient for the breadboards.
Mini board programing with big Discovery thru SWD port.
Finally a video of Blinker a status LED.
Progect in EAGLE and *.hex Blinker