I ordered the 600 version before reading that the 400 had better grip on the bottom sole. So I ordered 400 to compare. I ended up returning the 600s and keeping the 400s for myself. There isn't much difference between them. Both are good. But I have attached pictures. The top is exactly the same. I found no difference in strap length or material. The bottom end is very different and the 400s definitely have better traction. The design of the lift is also slightly different. The 400s are spotted and the 600s are striped. I'm not sure if walking with a wet foot or not will make a person feel better/different over time.
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