Apparently it wasn’t everyone cup of tea but personally I loved it. It makes for a different sort of conversation - more live than the asynchronous back and forth messaging of most apps today. You can often reply to someone while they’re typing their message - and if you guess right they can stop typing and move on to read / reply to your response in turn.
I’m not sure how well it works in groups but 1-on-1 it feels more like a phone call than a messaging app; except it’s over text, it seamlessly transitions to offline asynchronous messaging if someone isn’t there and you can both “talk” (type) at the same time.