I recently received a dragonfly - only had 3 charges so far. It is so much fun! Anyway like others here I found mine has a tendancy to undulate which made it hard to fly and maintain altitude so I decided to try adding some head weight as suggested in this forum. I used stick on rubber feet - one on each side of his head so they look like big black eyes. The ones I used are the ones that come with Cisco gear (that you never use because you always rack it). With these in place and the tail ribbon I find it alot steadier. See Photo, notice I've also got a great stand for my DragonFly

http://img58.imageshack.us/img58/8103/0000522bbh9.jpg