I have used the Davis Shinguard's in the past they where good but the straps always stretched out and would loosen up.
I currently use Diamond Ump-lite Shinguard's
They have done me well including high level ball, I am a bigger guy and they still fit under my Base Pants. I like the 2 strap system.
When I am working high level Men's ball I sometimes where Wilson West Vest Umpire Shinguard's.
Nothing hurts when I get hit with these.