The cost-performance ratio is really good! You need to use a mobile app to control the timer and the number of feedings, so you must have a Wi-Fi device at home. It seems like there are differences between each feed, but the current amount per feeding seems to be between 15-20g. A separate USB charging adapter is required, and it's not rechargeable; you need to connect it to a power source with a USB adapter. There doesn't seem to be any malfunctions or any specific issues that would cause it to break down, so I think I'll get good use out of it. I don't know if there's a difference between expensive ones and cheaper ones, but I'm very satisfied with the price-performance ratio.