I want to say that b89's scar set is the most accurate I have seen or used to date, and I could not be happier with the design.
Since recieveing them, I have used them on two nights out. The first pictures are of me wearing the scars (no makeup) and using Pros-aid for the adhesive. The Pros-aid seemed to work well at first, especially during application, but as the night went on, the scars were prone to start peeling off. The Pros-aid simply does not adhere to the silicone well at all.
The makeup turned out good considering I haven't done it since last year. Excuse the background on these first set of pics - they were taken at the Dinner Theater that I am performing at (unfortunately, NOT as the Joker):
And here are pics of my second night out. I nailed the makeup a bit better this time around - I used less red on the lips, and this time I used Skin-Tite silicone for the adhesive. I have to say, without a doubt, that using Skin-Tite as an adhesive is the absolute best way to go. Not only did it allow for easy application of the scars, but it bonded with the scars perfectly and allowed for greater stretching and expressing of the face without having to worry bout the scars peeling off. Not once did the scars even begin to peel off the entire night. And to top it all off, they peel off very easily and painlessly whey YOU are ready to take them off!
This makeup is always a work in progress for me. I always learn something new each time I do it and it gets better each time. It's ironic how something that is supposed to look so messy takes so much time and effort to accomplish!