I cannot say enough good things about the Form 4. I love the sleek design, how quiet it is, the soft touch of the high-quality silicone, the fact that it is rechargable and has two powerful motors is an amazing added benefit.
I have many toys from many different companies, and this toy is BY FAR the best one. You can use it internally or externally, and the pulsing features are great. The fact that you can lower the intensity but still have pulsing features is pretty amazing--most other products do not allow for that.
Jimmy Jane Form products are for those people who are tired of toys breaking, or replacing batteries. The price on this toy is a bit steep, but well worth the investment! I love my Jimmy Jane Form 4!