Is it really useful to practice English on Italki with a foreign teacher?

Hi, everyone, i am Kelly from Shanghai,China.I just get my Master Degree and begin to work. Now the working lanuage is English. I hope to practice my speaking English online. Can you just tell me, does it work to chat with one professional teacher on Italki? Actually, i don't know about the details about online learning. Is there anyone who can help me? thank you.