LG's latest flagship phone, the G5, is a fascinating device. Just plug in optional modules -- excuse us, "Friend" accessories -- and you can enjoy extra functionality when you need it: everything from a camera grip with a secondary battery to an audio DAC that upscales sound quality. It also offers fast performance and a dual-camera setup that's actually a lot of fun to use. But while the phone wins points for innovation, the first modules fail to impress in real-world testing. Meanwhile, it's clear LG cut corners in other areas, with the forgettable design and middling battery life being the biggest offenders. As our reviewer Chris Velazco notes, the device has the potential to improve over time as new and improved Friend modules come out, but for now, it's a work in progress.