Similar to @
Pat , mine are at 40k miles now (and a lot of track days as well) and while they are not leaking, they barely work at all. Almost every bump is a two bounce bump (the whole point of dampers is to prevent the suspension from cycling up and down by absorbing the energy of the springs), im changing them this year, the only reason I havent changed them before is because im all stock suspension wise so Im going to do it all at once.
You should, while at it, get better dampers that would go better with a lowered application (the Bilsteins with shorter body are a good option).