It takes a little getting used to but overall makes it easier for people on the go , and yes you have to stay connected online.
One also has to be very clear when speaking to it , like most voice ap , a muffled voice can have Siri thinking otherwise , but one of the better ones I've seen.
Funny story , try telling Siri Thank you .... check the different responses
What's your Tale or Experience , overall works for me.