I shot the F9 SSO-A launch with my FLIR One back in December. Visually it was about the same as yours, but what was surprising how well the iPhone picked up the low frequency rumbles. Playing it back on a stereo with a subwoofer was entertaining.

After being to several launches both watching and photographing, I'd advise first timers to watch with their eyes first too. The flame plume is a very bright, oddly "rich colored", orange fire that video just can't capture. 60 seconds later it's all over, it's hard to watch both the rocket and viewfinder.