I always confuse "Hard" type onaholes as being stimulating so I was a bit disappointed on the level of stimulation this provides. The mini-folds feel great but it's very dependent on the kind of lube you use; using thick lubes lessens the feel of the folds a lot. Best paired with thin or runny lubes. Build quality is okay - cleans easily without having to turn it inside-out. Be careful turning this inside-out though as mine developed a small tear on the insides once as I was cleaning it. If you're looking for a more intense stimulation with similar design though - I'd suggest adding a few extra yen and going with the Shuriken or Kunoichi series by Hot Powers instead.