We just had this discussion in the commuting forum.
http://forums.roadbikereview.com/showthread.php?t=56727
I had one of those Axiom racks. I didn't like it. I found it had too many pivot points and would loosen up to easily. For my bike, a Cannondale Cyclocross Disc, the little arm on the left side was poorly positioned to reach the mounts for the fender or the brake mounts.
http://forums.roadbikereview.com/showthread.php?t=56727
I had one of those Axiom racks. I didn't like it. I found it had too many pivot points and would loosen up to easily. For my bike, a Cannondale Cyclocross Disc, the little arm on the left side was poorly positioned to reach the mounts for the fender or the brake mounts.