The only disadvantage I have found with hard sole boots, and it may be specific to my Bare 3mm hard soles or my fins, is that they tend to get stuck in my fin pocket during the dive. By stuck, I mean really stuck, but it was not a problem when everything was dry, so I did not notice it until after using them in water. Switched to SP Delta with a medium sole for my typical warm water boat dives, and they worked great. However, if I need to use the hard soles for places like Bonaire, I will take along a can of silicon spray. Other hard sole boot or fin combinations might have given me a different experience, but once I dove with them, I was stuck with them.