Much better than the standard fins. You can go faster and cover more ground. I just wish my Hobie Revolution 16 kayak with Mirage Drive 180 Kick-Up had come with them in the first place. They are expensive but robust and of good quality. Make sure you check the model of your Mirage drive before ordering turbo fins so you get the right ones.
These fins perform way better, in every aspect, than the stock HD 180 fins. Peddle resistance is a little less than the V2 turbo fins, but overall performance is the same.