I like the fact that the rail comes by itself (rather than already being attached to a raised toilet seat) and can be adjusted in height. It is easy to install, and it provides the safety my mother requires to sit down and get up.
The only issue is that it is a bit wobbly. For someone who is heavier and less stable on their feet, it might not created that feeling of safety compared to a raised toilet seat that has the rails attached to the seat itself.