Re: round house kick about to hit your head
I don't do it much anymore cause I have seen the light as I gained experience, but I will say, they can and do have their place.
To defend, It is best to move in on the opponent (irimi) and blend with the kick and then off balance uke and take him down to the ground.
Blocking kicks or catching is not a good idea IMHO. Against someone who is a powerful kickboxer or muay thai guy...you can miss and/or get seriously hurt. Moving works best, it takes away the power and point of impact.