I purchased the Atom to work with my Studio One 4 Pro DAW software and really like the workflow and versatile pads. The Atom has easily assignable pads for various sound sets. The pads are perfectly responsive to my choice of midi plugins. There are several banks as well.
One down side is that the Atom does not have a power switch and remains on as long as the PC is on. It doesn't cause any issues or use much energy. Hopefully, there is a fix coming from Presonus. However, to avoid connecting and disconnecting the Atom and taking a chance and having a loose USB input, I just shout down my PC at night. You could use a switchable USB Hub to solve this issues as well. I might do that in the future. Never-the-less, I really like this controller and would recommend it to anyone looking for this type of device.