Cognitive behavioural therapy

Hi all I have been given the option of doing Cognitive behaviourl therapy has anybody done this and found it useful? I have been feeling low for a while now and really don’t want medication. To attend the course i will have to get two buses or a taxi ( I don’t drive) just wondering if it’s worth the expense. I have done some reading on the internet but would be interested in someone’s first hand experience, if you are willing to share.