We had good results using just earbuds and more advanced listening devices arent necessary until you get to advanced levels of the program, but we decided wed give them a try. So, comfort wise, I could only tolerate the PX for about 30 mins. He never even got to use it once! Just depends on how strong your charging pad is I guess. heavy, sturdy, well made. 5 or 10 depending on the shoe and I got a 9 which fits well. , but i am too old to care, especially what i wear around the house. I was able to put my prescription on them. My foot is moderately wide, not enough to order a wide size shoe but enough that some medium width shoes can be a bit tight. So far I am really pleased with these and would recommend them.