Cycliq cameras are a good one if your main concern is road safety. I also tried gorilla pod mounting my iPhone to the bike, too many micro vibrations that are further increased by the phones digital image stabilization not knowing what to do. That’s normal though as digital stabilization has always been poor mounted on tripods and solid objects.
GoPro is definitely worth it. I bought an HD Hero 2 on eBay last year, partially cuz cheap and also for a big part of nostalgia. The vibrations aren’t too bad with the ultra wide angle lens. Most the footage I get is clear.