I've bee wearing these since the middle of last year, and they have been great.
I wear them with a full boot, and they tuck in nicely. I did have to adjust the top of the boot to make it just a tad wider, to accept the bottom of the guard over my shins. The straps have held up with almost daily use (sans winter). They're comfortable, and I wear them under a pair of Joe Rocket textiles which I removed the pads from. Used to (and sometimes will) wear then under a pair of jeans, with no comfort/fit issues.
I had the slowest of low-sides in my garage the other day (working off the rust), and I would do it again just for the slide. Didn't feel a thing. They seem to hold in place well.