well heres my 2p worth - I have an LS430
I bought the all singing dancing Michelin Stealth - not cheap - they started juddering badly after 6 months - I tried cleaning them and the screen and the juddering did not improve.
I then decided to try the other end of the price spectrum and bought a pair of aero blades from ebay (i think it was mr silicone hoses or something) they had sold hundreds so i thought lets try them out - cost £4.50 - had them over 6 months and they are still brilliant - smooth, quite and a crisp clean wipe every time and at that price I would be happy to buy a new set every year if needed.
HTH