Did it on my 2009 and all good so far as was just starting to get a tiny bit of wear (magnifying glass style) – Dead easy to do – just read the enduro instructions online 🙂
I did mine after 15 months – You don't NEED to do it – but a wiper service is important IMHO 🙂
To cut it short – remove the outers upsidedown – pop off the seals with a flat headed screwdriver and push the new 2 part ones in with a suitabllt sized socket 🙂 – reassemble (see instructions for wiper seal service )
http://www.cyclistno1.co.uk/features/maintenance/fox-forks-wiper-seal-service.htm