Eupho and do-nothing? Also general questions…

Does using the Eupho to the highest degree possible require voluntary contractions and clenching, e.g. kegels? In other words, does it work well with the do-nothing approach? I’m asking because I read the following somewhere: *”The design
means that the Eupho will move the most of all our models. Therefore the user needs to have highly developed PC muscles in order to control the Eupho. The thin head will “dance” all-around the prostate providing subtler sensations than the other models.”* Does that mean the Eupho only works if you actively make it work via muscle contraction? Would it work if I just sit with it in and chill? Not actively and or aggressively stimulating or arousing myself, but just chilling. Of course, involuntary contractions would probably happen once in a while and get things going occasionally, but would those be enough? Would the Eupho work in that situation?

Also, and just in general. How is the Eupho? The Aneros website puts in an ‘advanced’ category, above all other models apparently. Sure, maybe it takes high level skill, but does that also mean the pleasure and peek that one can go to is also high level, above what the other models have to offer?

Any pros and fans of the Eupho that can share what they think?

Thank you in advance for any input, I really appreciate it! =)