I refuse to do it.
Jackson tested positive for lymes after coming up limping (3 years ago), so he was actually showing symptoms. He was treated very easily and back to normal within a day of meds (that were not very expensive). His lyme test is now negative and I keep him on either advantix and frontline as much as possible (but even that I am not religious about - don't see a need unless I start seeing ticks) which I feel is enough prevention. Our vet does not recommend the lymes vaccine for us, especially since people are trying to link the vaccine to possible kidney problems and sometimes even symptoms that make it look like they have Lyme's Disease. Also, the lyme vaccine does not protect every strain or types of tick-related illnesses.
Good reads:
01 Lyme Disease - VeterinaryPartner.com - a VIN company! http://www.drschoen.com/articles_L1_11.html