I have used the ARC rings with good results and as a result of this thread ordered the Hal-o rings from Herbie's, not to be confused with Herpes :)
These rings improve performance in several areas but might vary with the components they are used with. First there is a notable lack of microphonics in my new Supratek preamp which I recently received and which was a bit noisy at times, especially with those confounded but wonderful Ken Rad 6SN7 line tubes. The other area is clarity and image focus which I also noted with the ARC rings. They are well worth the expense and to answer your question, yes, they do work. As with all such things, YMMV. For the cost I would give them a try since there is no obligation if they don't. A cheap tweak worth the expense.
These rings improve performance in several areas but might vary with the components they are used with. First there is a notable lack of microphonics in my new Supratek preamp which I recently received and which was a bit noisy at times, especially with those confounded but wonderful Ken Rad 6SN7 line tubes. The other area is clarity and image focus which I also noted with the ARC rings. They are well worth the expense and to answer your question, yes, they do work. As with all such things, YMMV. For the cost I would give them a try since there is no obligation if they don't. A cheap tweak worth the expense.