I’ve used IsoAcoustics products elsewhere and like them.
My new Majestic 845’s required 18 footers. IsoAcoustics Gaia’s would have been too cost prohibitive for me. So, I went with Herbie’s “Threaded Stud Glider – GIANT”! I didn’t audition the speakers without footers, so I’m unsure how sonically beneficial the Herbie’s are. Even if they are modestly so, the GIANT’s improve sliding on carpet. For critical placement listening, they serve the slider purpose quite nicely.
FWIW, I have auditioned other Herbie’s products and they always have performed well above their price points.