It’s an excellent resource, very simple to use.
The Word One to One has been a really helpful resource. Advantages include: it‘s all of John's gospel, so all about Jesus; it’s not 'over' in 6 weeks, leaving you wondering what to do next with someone who is still thinking, or who needs to keep on getting to know Jesus; it provides explanations, with the benefit that I am not giving all the answers but appreciating the truths alongside the other person. There is then plenty of scope to discuss matters raised.
I have seen good discussions arising from the study, growth in faith, growth in ability to answer questions for themselves, and sadly, someone turning away, as they saw the exclusivity of Jesus in John chapter 3. I find it an easy resource to use, and have seen God work powerfully through it.