The sign on process is very simple. You setup whatever account you prefer and fill in your screen name and password. This is a one time thing as it saves in your iPhone. You then click status and you can choose online, away, invisible, or offline. There are four tabs at the bottom to choose from as well, contact list, inbox, status and settings.
What's nice about IM+ All-in-One is the fact that you can be logged into all of these services at the same time. The contact list is simple and very easy to read. You can simply click the name and message them. The messages can be deleted the same way an email is deleted, with the finger swipe.
The only issue I have with this application is one that is similar with some other messenger applications. When you close out of it to go back to your iPhone menu, it signs off. Therefore you have to sign in and out if you want to browse other options on your iPhone.