That's awesome. I have been wanting one for filming rc as well a dirt bike riding on my dad's track. Also i could use it for work as i do real estate and having some elevated pictures are great attention getters. I never really considered speed when looking but having it is a good idea for sure, can't film it if you can't keep up. I'm becoming more impressed with it every time i talk to an owner of one (or in your case two). The main concern i have had is that i don't want to have to buy a dam*** ipad or a new phone. If they had one that came with a mounted screen i would prolly buy one now lol. You said that you have put over 200 mi on it, does it keep stats like that? Pretty neat little extra feature.