I replaced four Symposium Rollerblock Jr's under my Esoteric K-03 with four Stillpoints Ultra Mini's. I did not think I would hear an improvement over the Rollerblock's but I certainly did. The dimensionality of the soundstage, both front to back and side to side, took on a clearer focus. The individual musician's locations were more accurately defined, more perceptible. Stillpoints are the real deal. Priced like it, too.