Bonded Routers

Does anyone have experience using a bonded router? I read that they create a faster and more stable connection, but every router says that. It also seems to really only be beneficial if you have multiple broadband ISP's that you can tap into, which most people do not have. I typically use an ethernet connection for everything other than steaming TV content, but I am intrigued by the idea of a more stable wifi. I already use wifi six, but that is going to be outdated soon.