I have had one on my Well Tempered arm with Grado Sonata for about six months now. I am very satisfied with it's performance, better low bass definition, less surface noise, better soundstaging. The price seems high, but the materials have to be made and assembly isn't easy. I would think the idea is worth something. For me the improvements are well worth $150. Definitely not a rip off, though YMMV.
I did have trouble with my first sample, it separated with the cartridge attached. I believe a different adhesive is now used. The dealer replaced the bad sample promptly.
I did have trouble with my first sample, it separated with the cartridge attached. I believe a different adhesive is now used. The dealer replaced the bad sample promptly.