For me the stability thing is not relevant since about X2. I used to have freezes when using melodyne. I am happy with stability of sonar. since X2 sonar seems to detect everything plugging in and out and ask if I want to add it. the audio drops out when I am doing too much but that is when I have made the driver settings in preferences too fast so I can "input monitor" with no delay for vocal recording. so when mixing and playback on my computer I need to set the slider over to at least 11-15 ms delay to stop audio from dropping. When recording I use a simpler mix down (turn all the plugins off) and slide the slider bar to the left for better input monitoring, so I can hear the reverb or guitar effects on vocals or Guitar. So I can't validate any stability concerns. However maybe for one of these monthly updates, the bakers should just make it a patch/update month. where all they do is deal with any outstanding tweaks that have fell through the cracks.
I know one. The Equalizer in the pro channel has a real time spectral analyzer view which shows the wave in the background of the eq display. It is not exactly sound accurate as if you create a low pass filter and filter out way above where it shows the highest frequencies are, you can hear it taking out some of the very high. If the screen is displaying the sound accurately then it should not have affected the sound yet. (according to the RT spectrum on the screen).
There are probably dozens of little enhancements that can be made to existing features like this so maybe once a year they should not do new features but have an update rollup that just deals with making what is there more bullet proof. That may be a bad example as it may make more sense for sonar to contract with fabfilter or someone to make an alternative plugin for the pro channel that already has tons of these features figured out. (I would love fab filter to be intertwined with sonar like melodyne is. )
Anyway I don't think Sonar is a "should have been". it is more relevant and constantly adapted than anything. Now spectrasonics software and east west software? Spectrosonics (Trillian , Omnisynth)has an update path that must circle the moon and east west just keeps bundling the same old stuff. Thats my opinion. I couldn't find a more dynamic in tune development community and shortest path first update strategy then with sonar.
I LOVE presonus products for the most part. Not the preamps too much. But the scepter monitors and studio live AI stuff is a staple in my studio and live rigs. Studio One? I have it not even close. Sorry. This was obviously an ill informed comment. Keep an eye on studio one if you have an extra one. When I come across something I can't accomplish in Sonar with plugs ill wander about more.
I have logic, studio one and have used pro tools. Just my take on it.
Had to edit my comment. On updates and logic. Really? where are the logic developers? You know to use the program full screen you have to change the resolution of the monitor? yeah don't talk to me about logic. eww... (track templates sound good out of the box though..thats it).