I wanted to use the Teensy on a Hexacopter to log flight data from the CanBus. Weight is all important there, so normals headers are the best approach. This would have worked, if I did not give up the multicopter flying as a hobby... But by then the Teensy was already soldered to the daughterboards.
First I tried to use solder braid, but this did not work. Then I used a Dremel to mechanically cut the daughterboard loose. Afterwards, I could de-solder pin by pin, which worked nicely. In the end, the Teensy still seemed to work fine, except for the LED which no longer lit up.
Anyway, I gave up and am now awaiting the delivery of a new Teensy 3.1. For 20$ I wouldn't even have tried to cut the daughterboard loose, but in Switzerland I have to pay at least 40$ for a Teensy 3.1 ;(
I now ordered from the USA, which is cheaper (30$ including shipping), but takes 2-3 weeks.