Sturdy
I used these to hang an old baby gate onto a wall to use as kitchen storage. The saddle clamps worked great for this, but it's not their intended use so I can't review them as such. Website could be easier to navigate to find the right product but then again, I'm not its intended audience.
Thickness varies
of the 130 I ordered, quite a lot were 2mm smaller on thickness than the nominal size (they are cut to thickness so I expect maybe +-0.5. Not great when sold as a spacer. Also had a few that were M12 rather then the M10 I ordered.