Took mine on a weekend trip and a short flight, no drama. Stops the stink and the auto-clean is actually useful. Battery held for a couple days but yeah, charging is an extra thing to track. If you already like your insulated bottle this is more convenience than necessity.
Not convinced offline mode will handle real flowing conversations. I tried one and it caught parts sometimes then mangled longer replies or accents. Fine as a backup, don’t plan your trip around it.