DD just had the 18mth one for chicken pox last week. She had no reaction to it and actually had a bit of a cold when I took her in for the needle (when do they not have a runny nose when they go to childcare).

As children we were all vaccinated against chicken pox. We all still got it but very mildly and recovered quickly. Later on at the age of 20 I got shingles but I dont believe that has anything to do with the vaccine. I think part of the reason that more and more younger people are getting shingles is due to the amount of stress we are put under, juggling busy social lives, studying, working, etc and not looking after ourselves. That is the reason I believe that I got it. My immune system was lowered because of all of the above.

I have seen a lot of awful cases of chicken pox in unvccinated children and its awful for them to deal with where as I honestly think (and speaking from experience),dealing with shingles as a young adult is much easier to deal with (as painful as it is you know not to scratch, you understand why you are in pain, you can monitor your pain medication a lot easier)

HTH Either way its a personal decision and I think your own and your family's personal circumstances and experiences will play a major role in your decision.