I have been using these oarlocks for three years and they are as tight as the first day. They do not squeak, rattle, or wobble. They are great for open water, rough conditions. You fit one set on oars and leave them, so if you have several length or style of oars, you'll have a set for each. They work perfectly and unless you want a super-traditional look, these are the best locks I've used from puttering around to full out fixed seat competition.
the product seems perfect so far. i obviously cannot yet tell how durable it will be, but that will probably be ok too. it is designed so well that flaws in my oars i could not detect before are now easily detected.