For me it's not so smooth compared to Amethyst, often freezes, even if it has less features (read/write relay conf, zap notifications, lists, notes details, etc). I haven't checked the battery and bandwidth usage, but I don't have a flagship phone either.

However it is really polished and have a sensible and curated UI.

I agree, I cannot understand a "B"(itcoin) marked logo at all.