bapu
...would you do-over SONAR purchase?
I'm 99.9999999% certain I would.
<edit> Not implying deep pockets, just if you were not strapped for cash.
That's a valid question and I am going to assume the question isn't rhetorical and you want others' opinions. In my case I wish I had moved to Cubase earlier instead of opting for the 2015-16 membership upgrade from X3 (I've been using Sonar since v6 or 7 and upgrading regularly). That's not to say that I don't like Sonar, just that Cubase fits my needs so much better. To me Cubase has a cleaner, more functional interface and the MIDI and Score editors are working well for me. Lastly, Sonar's monthly distribution, which combines new features with bug fixes, didn't suit me; too disruptive.
Considering the $$; if I were to stay with Sonar and obtain a lifetime membership it would have cost me $350 over the past year. Of course I did pay around $200 more than this to get Cubase so this approach isn't for everyone. Even though there is a "lifetime membership" on offer with Sonar it is more than likely that I would continue to pay $50-$200 per year to pay for some "additional items" which might be core to my particular workflow. I suspect that from here on in there will be little difference in cost whether I have Sonar or Cubase.
Cheers.