As far as the difficulty of shutting it off, with a little lube mine can indeed be difficult. The soft nature of the ring makes it into a poor resistance point for your fingers. My solution is to have a dry washcloth nearby, you can even hold it in one hand that way and get it to slide off. If you're still having difficulty slide your finger through the hole with the washcloth around them, and use a different part to grasp the bullet.
For the price, I really can make back the difference in just batteries. Maybe my partner and I are just a little too aggressive with our toys, but two to six watch batteries in an evening are just cost prohibitive.
And, for a Lelo product the price listed here on edenfantasys is WAY cheaper than what you'll find retail most places.