I don't have one. But, I'll give ya an iPhone tip. Put the phone in airplane mode if your going go record for a period of time. It will help with battery life as well. Also, make sure you have plenty of space left on your phone. Video storage takes up a lot of space, even short recordings.
Write a review on how you like it. I was checking them out earlier this year, but haven't heard anything about them. I'd love to know. Good luck.