I'm happy with SONAR, and especially happy with the direction it's taken in the last year.
But I'm not as happy as I'd like to be. I still experience too many audio dropouts on modest projects, especially considering the power of my system. I still get project files that seem to develop a curse of one kind or another; crashes, dropouts, distorted sound, what have you, that can only be fixed (as far as I can tell) by rebuilding the project in another file. This is not by any means a constant set of problems, but they are too frequent for my complete satisfaction.
Now I understand very well that it's not reasonable to call this a dissatisfaction with SONAR. It's very clear that DAW performance is a complex phenomenon involving not only the DAW software but my interface, OS, configuration, ALL my hardware, any other software that may be running with or without my knowledge, etc, etc.
I didn't start doing this yesterday. More like 25 years ago, not counting pre-computer recording technology. I've built a dozen or more PCs, and researched hardware and setup for audio extensively, not to mention making a sizeable investment in good quality hardware. So if someone tells me increase the audio buffers to reduce ticks or disable my network card, I don't mind at all - always grateful for any attempt to help - but I'm not learning something new.
And still weird glitches happen, most of the time completely unresponsive to the standard fixes. And though I may catch flak for this, the bottom line is that this doesn't happen when I run Excel, or PhotoShop, or CyberDirector (OK, Vegas yes...).
Forgive the long vent. I love SONAR, and I'm not changing DAWs. For one thing, I've been using it and its predecessors since 1988, for another I have no reason to think there's anything better. But I hope for a day when the probability of the program running and performing exactly as expected is similar to most other software on my computer.