I love these. Resistance bands are like having a portable cable tower at a tiny fraction of the price, though most are difficult to stack, thus making adjustments to resistance difficult. This set solves that problem. Switching out bands is very easy and there's room for additional ones, as I found out already, since I bought and added the purple stackable band to mine. I'll likely be adding the orange and atomic green, for a total of about 230 pounds of resistance. Which is not much lower than most cable weight stacks go up to, and for a total investment of like $75. Versus hundreds (or even thousands) for a cable tower. Bands have received an unfortunate reputation by their association with light-resistance high-rep use in trendy women's fitness programs, but I assure you that has nothing to do with their inherent nature.