Collaboration has never been this easy between an agent who takes the call and an agent who answers the ticket. I like how my agent was able to find all the notes and call specific details that another agent had with the customer on the same ticket. This note feature makes collaboration a lot easier.
I recommend you go for ProProfs Help Desk. They offer 24x7 human support and even have a vast knowledge base so you can get started quickly and delight customers.