In reply to mypyrex:
I picked up one for 15 quid in BM stores, pretty entry level, but I was just dipping my toe, and I will probably go for a higher spec if I find it useful. (I got the last one in our local store and the lad told me they sold out quick, and they will get more in at different price points in future)
Catching incidents apart , it is unexpectedly Interesting to the see details you miss, and then see , when reviewing your video of just your journey to work.
There is lots going on around you that you don't notice when driving that the film picks up.