I have a GoPro (wish I didn't spend out on it TBH) but phones these days are just as good in the car if mounted well.
Harry's lap timer is great on iphone but it has issues on android.
GoPro's are great for Action sports when you want to dub audio/music over the top, but the microphones are crap at picking up engine noise, and also seem to have a little electrical interference when fitted in a car on the audio track.
My son has a bullet camera we bought from Aldi for £90 in January.
It came with 2 batteries, storage case for camera and accessories.
It has loads of mounts which are GoPro compatible.
If they were GoPro genuine mounts they would of cost in the region of £100 - £150 just for the mounts.
It's great value and works about aswell as an early GoPro would
http://www.supra-electronics.com/pop...ce=accessories
Microphone is still poor but it doesn't seem to have the electrical interference or rattles that GoPro's seem to have.