Skip the lightweight Trainers unless you really know you can benefit. Lightweight Trainers are pretty awesome, but not everybody can benefit from them. If I were a coach I'd tell all but my elite to just barely sub-elite athletes to stay away from true racing flats. Because if you're not at that high level where a few ounces may make you better able to hold on at the end and speed your leg turnover by that sliver of a second for benefit, you may do more harm than good to use them. So if you haven't used them in Training, skip them.<br><br>
Moving forward, if you're not doing, say, sub-5:30 miles, I'd recommend getting yourself a lighter weight (note, not light-light weight) solid Trainer shoe and using them ONLY for races. That's what I do. It gives me the mental edge. But I've also done enough training in them to know they will last a hard 26.2 miles without much blistering on the feet. The premise behind this strategy is that I get both the support and cushion my body needs.<br><br>
If you have the money, go get yourself and pair and start doing speedwork in them. But if you are a larger runner, you may find yourself wasting your money, because the light weight racers/flats are flimsy and will break down after very few miles, especially if you have more mass to carry around.