All I use are MicroSD cards... One of them in my unit mounted on the Pi Plate has the Adafruit short adapter which locks it into place (hard to lose).
I can use them in a lot of other devices. I Buy 16GB class 4 cards with adapters for around $9ea and typically get 4-5 of them at a time. Always have 2-3 new in a package ones hanging around for whatever they are needed.
They are very small though and I can see where they might not be a good idea for some uses especially if you carry your RPi around a lot.
Dweeber A.K.A. Kevin... My RPI Info Pages including Current Setup - http://rpi.tnet.com