Overall, these are a good fit for me for now. But, Im not a fan of spending money just to get a potential infection in my foot. I can do things like continue to cook dinner while Im on the phone without worrying about dropping my phone in a pot of boiling water or hot grease. Their guide is crap. The bios version of this mb 4101 will run top speed of 1600! THEN both get equal sound level. It has helped a lot. I?ve haven?t been consistent using it but for a week I used the waist trainer and firing that week I noticed my curves being a bit more defined. I look after my headphones but purchased these in Sept 2017 and just over a years light use one of the ear pieces has stopped working. Its a nice compact size though and the price is right.