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Per Request: I Was A Dildo Engineer AMA(r/IAmA)
So I liked our products, but will not tell you who that was (sorry). Beyond that, I loved the bullet. What I found with the above, is that if you remove the middle battery and bridge them, you reduce the heat in the unit, meaning that it last almost 2x as long.
I personally hated the Durex Wand because it was ridiculously loud, but apparently that is not something women care about, as opposed to engineers.
edit: I mean females who are not engineers. I really do apologize for making them sound like to separate groups