(Image credit: Future) I’ve been testing running shoes for more than a decade, and during that time, there have undoubtedly been some incredible developments in the tech and materials used in the best sneakers. Carbon plate racers have helped set world records, while max-stack cushioned shoes have brought more bounce and fun to daily training. That’s why, in my running shoe reviews, I not only say whether a sneaker is actually good, but also if it’s a significant upgrade on the previous model, because the older shoe is more likely to appear in sales and save you money. There are a lot of excellent running shoes out there right now that I simply wouldn’t buy, because the older model is just as good as them, and in some cases even a little better. Here are five great last-gen shoes I’d be looking for in sales.…