Last week I met with some Oracle people for an OEM 13c presentation with some other customers to look at the great new features offered.
When they asked, "Who has installed 13c?". I was the only one in the group of ~30 who raised my hand. By the end of the presentation and at the urging of the Oracle guys presenting, everybody was going to rush back to the office and download and install it to take advantage of all the great new features.
This week I'm at Hotsos in Dallas at a presentation by Kellyn Pot'Vin-Gorman (DBA Kevlar), and she just mentioned a new revision of OEM (13.2) is going to be released in the next quarter with new features and a lot of refinements.
So...you might want to wait for it. :)