I have only tried Kendo once.. and it was a pretty sad effort!
But I have watched a lot of it and one of my friends is 4th dan and I think it would be my choice of a martial art if I had more time.
It is full contact and they don't hold anything back.
Seems real popular too.. I have seen lots of kendo training and some big competitions.
Biggest kendo competition i saw was about 300 people going for it at once!
Amazing!
Only downside is the gear is pretty expensive.
All that armor and the swords and stuff, but WAY COOL!!