Product review (2 stars): Not Durable
These units are not terribly expensive, and are relatively easy to install, which is good, as you will be faced with replacing them, regularly.  The caster assembly is the weak point, with the clips breaking with the slightest trauma.  Once installed, they adjusters work well.  Operation is smooth until they break, which, again, is often.  Of course, this is an OEM part, so what choice do you have...?