I think Symposium Roller block Jr HDSE work and sound even better!!
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Look into the Star Sound Technologies Apprentice platforms which are selling on Audiogon right now at an introductory price. I loved the SP-101 speaker platforms, so I bought one of these for my transport, and it is great, at an affordable price. And I should mention, the transport was already sitting on an Adona Zero SR4 rack.
This company knows their science. No gimmicks, and their products work as advertised.
Wow, what a dismissive barrel of "responses" to the OP's honest question.
I have tried the Spike Sound Will supports, under my Marantz SA-7s1 player (48 lbs) and my 2-chassis Cary preamp. Spent a few weeks with them, but ultimately removed them. The sound may have gained a bit tighter focus compared to OEM feet, but was generally thinner. Deep bass, especially, was lacking, and I heard no improvement in soundstage. I am currently using Stillpoints (mini's under lighter components, Ultra SS under amps)
As with so many of these footer designs, positioning is critical. It appears these magnetic jobs have an ideal "load" and results vary widely depending on where you place them, especially under a heavier component. Or maybe it was a magnetic field effect?
I might have achieved better results with more experimentation (and may still try them again) but the lack of instant improvement discouraged me. So many tweaks (and variables), so little time...