It's such a great software! Don't abuse it, though. There's a clause in YouTube's terms and conditions saying you can't use any bots that perform more actions than a human can reasonably make in an hour or something to that extent. They have a feature called "Canned Responses" that you're supposed to use to answer common questions that people have. If, for example, you start using that feature to reply the same comment to everybody at a rapid rate - that could get you banned by YouTube because they'll think you're using a bot.