I have used the plug type fix, which was holding quite well (both of them, actually). But then I did something silly, like say lowered my tire pressure, and they fell out. I gather that they are supposed to somehow bond with the tire's rubber, but that did now seem to happen in my case, don't really know why. Being easy to use, I just put a new one back in and had a far more interesting time ridding back out on dirt then on the way in.
DL1000 '06 *Green*
"All animals are equal, but some animals are more equal than others."
(such as the '1000)