Have edited my post above about the Nuraloops to include this update: despite the earphones feeling more comfortable after I'd changed the tip size, the material they've used for the earphone tips ended up irritating my ear and I got an ear infection, which is not a problem I'd ever had with my Shures. So my initial enthusiasm for the Nuraloops is now very much diminished.
Have edited my post above about the Nuraloops to include this update: despite the earphones feeling more comfortable after I'd changed the tip size, the material they've used for the earphone tips ended up irritating my ear and I got an ear infection, which is not a problem I'd ever had with my Shures. So my initial enthusiasm for the Nuraloops is now very much diminished.