Hi "ouchmyfeet",
BTW, I like your ID.
I use Nike "Air Pegasus" for its multi-use (road, trail) performance. Not the best for either, but capable on both. Its tread (when new) is adequate on trails. Over the years, I tired of maintaining a collection of shoes specific for trail-training, trail-racing, road-training, road-racing, and so on. In terms of durability, I replace the "Air Pegasus" about every 4 weeks or ~300mi. For Whitney, I use a one-week old pair to ensure break-in and adequate support.--Adam