Speaking from personnal experience with 3 of then: Having multiple will give you a clearer sense of the shape of the field the same way you use multiple fingers to run them over an object when touching. More spacial awareness if you will.
Imagine for a second being blind and touching a statue with one fingertip vs multiple. In both cases you feel it perfectly fine but in the second case you get a better idea of what it is.
As for amplitude and frequency detection I haven’t noticed any significant difference.
No negatives afaik.
They will not stick to each other if they are on the finger pad or on sides of the fingers that do not face each other (I have mine on the right sides of the fingers). The distance is too big to even feel the attraction.
Speaking of witch, I lowered the price to a symbolic 1 euro so that everyone can have access to it #openscience
I don’t think I’ve ever posted this here, here is a video froom my lab reserch on them, I feel like it’s relevant in showing the tech opportinities of fingertip magnets and gives you a visualization of what I’m saying: