The smooth surface really does make a difference, no drag at all going in. The 3.5 cm width feels substantial without being uncomfortable, and cleanup afterward is quick since there's nothing textured to fuss with.
Richard★★★★★
Wasn't sure about the size at first but it's actually really comfortable. The smooth surface makes insertion easy with barely any friction, and the diamond shape adds a nice bit of extra sensation.
Richard★★★★★
The 3.5 cm size is perfect for me, and that smooth surface really does make insertion effortless. Used it solo and it's become a regular part of my routine.