I have had the same pair of Ultraboosters for 5 years which I absolutely love. They fit very well and feel better than any shoe I've ever used for running before, but they've seen better days and it's time to replace them. I figured I'd be fine if I bought the same pair, but these are definitely not the same. The grip in running shoes is very different and hurts when running. At first I thought I might just have to hack them, so I kept using them and it only got worse. Now I've missed the return date of the month and I don't have $180 for shoes I can't even use for training. Super frustrating.