I just got my ego usb/passthrough battery over the weekend. I got it from janty $29.95 + shipping. Ordered thursday got it on Saturday. This is my first ego product so to speak. I have a Riva. It is a great idea passthrough and spare battery all in one. It works great. I do like the button on my riva better. The button on the ego is hard plastic and on my riva it is rubberized. I do like the feel of the unit it self though kinda rubberized. It vapes well. I am using a 510 maga atty and cart.