I am not a dedicated slide player, but I bought a couple Dunlop glass slides to add a bit of variety to my music. This particular one, the 215, has quiet significantly thicker walls and, naturally, weighs noticably more than the other model I bought, the 210. The latter is described as Medium, and this one is described as Heavy. Due to these differences, it takes a bit of time to get used to when switching from one to another. Despite a few very minor imperfections, which do not impart usability in any way, I am satisfied with both the fit and the tone of the slide (trying to figure out the right size was a bit stressful). I think, it is a useful accessory to have for adding variety or simply tonal color to supplementary guitar tracks on a song. Since it forces to think differently, it can inspire the creation of new music and thus might come in handy when the writer's bloc hits.