To build your own micro quad, you can either use a flight controller of one of the many RTF micros out there, or try to get your hand one of of the growing number of programmable FCs.
Here are the most interesting properties of a micro flight controller:
- size (does it fit your quad)
- ESC capacity (usually 2-6A)
- programmable or not
- if not programmable, you might only be able to use that FC in a similar quad. Significant changes is frames size, motors or propellers might impact the flight performance.
If you want to use an FC of a RTF model, you are in most limited to the stock transmitter, and the size of the quad you are building should be similar to the clone father, otherwise the flight characteristics might change significantly.
The FCs from Blade come with the refreshing ability to bind to a DSM radio.
If you want more freedom in your build choice, or tune the flight characteristics, look at Arduino based flight controllers:
Most of these boards require soldering skills to set them up, and programming or at least general computer skills to tune them.