Yes - its my head, I've only got one if them and medical science is somewhat lagging behind in brain injury compared to the rest of the body.
Yes. See above. For those that say no. IT'S YOUR HEAD!!!! Its not just about village bowling being slower. With local cricket, there's more propensity for wayward run out attempts, beamers, lack of sightscreens, top edges into your face, people generally doing stupid things, i.e. throwing the ball in when there's no chance of a run out, etc. Not sure I'd want to gamble on a run oit attempt from 10nyards away where the guy ends up hitting my melon instead of the stumps...
No. Has to meet the above requirements and be comfortable, wearable and practical.