The drag and drop visual builder for creating the chatbot logic. Very easy to use and lots of power between zapier integrations and all the collection/chat message types. They also have a lot of pre-built templates so you don't have to start from scratch.
There is no live chat option, so you cannot have an option to bring in a human and convert to a live conversation if the person wants. That would be the only thing to dislike about Collect.chat.
Spend time planning out the chat bot script for the various areas of your website before you start to work in Collect.chat so you have a better idea of the desired script/outcome.
Having a 24/7 sales and support person essentially via a bot. This allows users to get the information they need without having to submit an email and wait for an answer.