poly flex bush's are they worth it ???

Welcome Mr_m, you will get a better response to your question in if you try this section of forum http://www.briskoda.net/forums/forum/28-skoda-octavia-ii-2004-2013/ When in that part you can also use the search box at the top right to search just within the Octavia II section in case there is already a definitive thread about them, or just start a new thread.