Conversations has had frequent complaints about battery life issues, which to my knowledge have always been closed with some variation of "just ask about this on the chat" and/or "this is not something that can be fixed". In the past, I've noticed it doesn't work well for my battery life personally as well (so it's not just rumour).
For something that needs to run on a phone, battery life is one of the most important factors to make something actually useful. While the GUI looks great and I don't remember any usability warts, I don't think it's fair to recommend something with an issue this big.