I'm happy for decision to stop Sonar4Mac development,
it is unfortunate for all the Mac users, but I believe it was an only reasonable step for Cakewalk to do,
funding development of multiplatform software which is burdened by "legacy" Windows code is impossible task,
better keep advancing on one platform, than challenging each but loosing against competition on all,
me, I've known Sonar since version 8 or so, and I really liked it immediately (and believe me, I've been using practically all major DAWs at various studios and events through time), been fan of X1 and X3, latest version of Sonar are impressive as well,
but things started to look grim with launch of Windows 10 and whole Microsoft thinking, so about half year ago I finally made a choice to start leaving Windows (summary of all the reasons would make up a decent book) and I managed to make bootable OSX El Capitan on my X99 workstation (yes it's a hackintosh, technically illegal to use, but it's not a commercially used rig, and I do have some macs around aside),
as I'm a multiplatform user, I did a big research on which DAW to pick and use, and finally went for Reaper, recent versions being finally usable, reliable, extremely lightweight, and performing great on both Windows and Mac OS(X), so ease of moving projects is unbeatable which is crucial aspect for my workflow
- that said there are things I'm seriously missing compared to Sonar (ARA Melodyne, keyboard shortcut to set all tracks height to fit project window, built-in channel strip etc..), but it's a good alternative for OS(X) platform :)