Works as expected. Great on a precision or jazz bass. A bit too low for a hofner. It Can be used on a rickenbacker, but the sweet spot for me is over the edge of the pickguard. A zeromod ordered for the rick.
In all cases the suction works well for 4 hours of a performance. The fin is very firm and comfortable for the duration of the show. Quite stubborn when trying to remove it and I worry I'll damage the suction cups. It's really great to put further back near the bridge to get a brighter sound.