IMS is extraordinarily reliable, and I believe a lot of that stems from it being based on the IBM Z platform. It's great to see IBM making the necessary investments to make IMS and the IBM Z platform (as a whole) ready for a new generation of IT Professionals. There is a bit of a learning curve of using TSO and ISPF, but navigating comes naturally after some practice (similar to learning the command line and applications like Vi and emacs on UNIX/Linux). IBM is also creating new interfaces through the Eclipse IDE. That gives IT Professionals and companies a little more flexibility in equipping administrators and developers with tools that they are likely accustom to already.
Understanding the structure of IMS databases and the DL/I interface with the database may take some time to get used to, IBM is enabling the use of SQL to access and administer IMS Databases. That will give developers and administrators, who may not be accustom to the mainframe or DL/I experience, a familiar language to use.
We are building out some of the newer infrastructure pieces of IMS so that applications developers can take advantage of the more modern features of IMS. We are also using IMS Replication and Change Data Capture to leverage the data stored on our IMS databases to be made available to processes and systems used in data analytics. The IBM Z platform and IMS proves time and time again to be incredibly reliable.