its been in beta for a year and half. Im also comparing them because the Er2xr is what I will still use for sleeping, besides these, as these foam earplugs cant quite completely replace them. 5 hours to charge from 0% & lasts a little less than 6. - They have a round, ample toe-box -- which I find more aesthetic than the basic (yawn) toe-cut, and it is healthier for your foot. What I got will help I M SURE. Im not sure why the app reviews were so bad. I think the instructions need to bed clearer. Saw these and loved them, so pretty on with a summer outfit. This looks nice and installs easily, I wish there was more room between towels when they were hung. The sole separated during the first time wearing it.