Overall, it is a functional app that is usable in all the ways I would use it on the desktop.
The homepage is where theoretically, all the most popular destinations on Sermo is shown.
Among the homepage buttons is "Followed" which are postings that I either am following or actively participating in. It would also be nice if there's a button to direct me to my specialty postings rather than clicking on "Posts" (which lists all postings in chronological order) or "Popular" (which lists the most popular postings in terms of activity) and than selecting "Specialty" which is the 2nd most common destination for me. "History" lists all postings or messages that I recently visited.
Adding a new posting appears to be fairly straightforward with two options... One which is triggered by taking a picture (iConsult) of an abnormality (like a CT scan or a rash) as well as one without the need for a picture (Create Post). The iConsult button is a leap forward better than what the desktop can offer. With iConsult, I can use the iPhone to take a picture, add a brief background history, and post whereas with the desktop, you would have to take a picture, transfer to the computer, logon to Sermo, and add the photo manually when creating a new post. The iConsult has resulted in the addition of a new section on Sermo... when I last checked, there's already been 5 postings to this section.
With any postings, I can add a comment easily or view a brief bio by selecting on the commenter's user handle.
All in all, a great free app currently available for the iPhone only.