Did some rsearch and found pros and cons. Here are some of them:
Negative points:
supports local DeltaV I/O. They can talk over DeviceNet, AS-i, and Profibus DP to field devices, but they have no concept of remotely located I/O modules.
has no capability to upload the user program from the controller. They can only upload data values.
can only execute as fast as once every 100 msec.
No solution for pulsed outputs such as control of resistive heaters in extrusion applications.
Do not support any event tasks for higher speed control
only supports FBD, SFC, and a limited version of ST
supports a “partial download” form of online editing.
A Control Module (somewhat similar to a routine) must be taken offline to download changes to that Control Module and then put back on scan. All other Control Modules in the controller continue to execute while this occurs.
DeltaV can only do process control - not for plant-wide control
Limited selection of IO
Positive points
Redundant controllers can be flash updated with no loss of control.
offers a redundant terminal block which connects to a pair of I/O modules and provides a single termination point for the user.
Redundant I/O modules are treated as a single module by the programming software and are automatically swapped on failure.
Terminal block does the switching of the field connection to the I/O and is a single point of failure
allows you to save control templates in a library for use in other projects
All this information is relative of course. But that's what I found