Hi all I thought I'd share a couple of infos that could be valuable to some of you. I received my Mac Pro this week, and installed the Pegasus2 R4 diskless and Dell Up2414Q 4K display. Pegasus2 R4 was plug and play and my former disks moved from another enclosure were immediately mounted in OSX. However the Pegasus2 is not detected by the Pegasus Management Utility ?! so that wasn't a great start. However the pegasus command line utility (terminal > promiseutil) strangely allowed to manage the enclosure, but it took a while to figure out how to use the command line, but now it's getting better and better. No idea though why the pegasus utility wouldn't work. The Dell 2414Q is great and after switching to Retina like HiDPI mode 1920x1080 is a great setup, i get full resolution images for my photo editing, while retaining a normal size user interface, so to me that's perfect. Still could not manage to enable the 60Hz mode even with OS X 10.9.2 update, unfortunately. No big deal to me as i don't do much video editing, but still annoying.