I recommend you take a look at the video lessons by Caitlin nic Gabhann. She has three online courses Beginners , Intermediate and Advanced. The quality of the videos is excellent with a camera pointing at each hand as well as the head on view. Clear explanation of what she is doing and critically why she is using one alternative button over another.
There are recordings, notation, slow down and loop facilities. In my view the package is superior to that offered by OAIM.
You can see the free lessons at
www.irishconcertinalessons.com