So I have worn custom ear plugs for years now, with the 15 insert, though not 1964 brand. These have been great for reducing any further damage to my hearing I am sure of. But, in the back of my head I keep thinking that IEM would be even better with much greater ability to know what is going on with other musicians. So last week, after reading this entire thread, I bought some A4's - Monday this week they accepted my molds so the wait begins. It is a mixed bag as currently my main gigging band is not IEM, however, we do mic everything for the PA and there is an aux out for me along with WIFI connection to do my own mix - which I currently do with my wedge anyway. So even though I have to keep hauling my rig at least I will hear everything great along with hearing protection. So looking forward to trying these out!