ASICS... how they holding up?

My ASICS 2150's have ~110Miles on them and are about 2 months old. They seem to be holding up pretty well and hope to get at least 250-300Miles out of them. At my running rate, I will need to get a new pair of shoes in April and break them in before the the Boston Marathon. The soles of my running shoes are wearing out before the tops even get dirty. I may have to switch to trail running!