I have a Vivo V21 and the camera quality is impressive, especially in low-light conditions; it holds up well against other brands. The battery life is pretty solid, lasting me through the day with moderate use. As for the user interface, Funtouch OS is intuitive, but it might take some time to get used to if you're transitioning from a different brand. Vivo tends to be consistent with software updates, though it might not be as fast as some competitors like Samsung or Google. Overall, it's a great choice if these aspects are your focus!