I have used this plate for 2 years now and it stinks.  The crown in the plate is ok ... I don't mind that, but the snap in rings are a bear.  You have to use a hammer and hit it hard to snap them in and out.  Last night I was hammering them out and the whole plate shattered.  Now looking at Rousseau's higher quality router lift I find that it has the exact same plastic top and the exact same snap in rings.  Being a weird sized plate means I'm now going to have to re-build the top of my router table to accept a better quality router plate.  Spend the extra cash and get an aluminum plate with quality snap in rings. Also Rousseau's customer service is a nightmare.  This has a lifetime warrantee so I called to get get a free replacement after I broke it.  3 months and numerous phone calls later I FINALLY got a new one from them  ... with the same stupid problem.