Automatic masturbators have ease of use since you do not need to hold them; other features enjoyed include suction, vibration, and thrusting features not found in a manual masturbator. This is a plus and creates a better experience, making the feeling more intense and diverse.
No, most are not difficult to operate because automatic masturbators are usually developed for easy use. They and generally equipped with easy to manage controls and provided with variations that can be adjusted for creating the best scenario without much problem.
Cleaning is straightforward. Any electronics must be removed, and you should then wash the sleeve with warm water and mild soap or sexual toy cleaner. It is highly recommended that the toy should be thoroughly dried before storage to avoid germination of mold and bacterial formation.
Yes, this is true many models are made in such a way that is small in size and can be easily hidden and used in private. Some of them actually mimic just about anything and everything, making sure that they are inconspicuous.
I agree that it is advisable to use water-based lubricant as it adds on the feeling as well as on the material of the toy. Do not use silicone based or oil based lubricants as it has deteriorating effects on the toy.