Let me speak from the view point of a relatively new user to Sonar. I started using Sonar Exclusively when X3 came out. I bought it the day it came out. Let me start with some backstory...
My first DAW (so to speak) was a program called Musicator. I bought it for a whopping $69 back in 1998 or so. I used a Korg 01W/Pro as my keyboard / controller and a Yamaha MU100r and a Roland Soundcard for additional MIDI sounds. Musicator was revolutionary (to me) because not only could you do direct audio recording, you could also do Step Recording for MIDI as well as direct notation like the more expensive software that I could only dream of affording. There were no FX bins, you had to use external effects. There was no easy way to line up audio in time. Looking back, I have no idea how I even survived.
Then Windows XP came around and ruined my music world. Musicator HATED Windows XP. I struggled and got it to work with various patches they supplied as well as having to run it in Compatibility mode.
Then I discovered Sony Acid and Cool Edit, which later because Adobe Audition. Acid was amazing. The drum loops were killer. I loved the interface. I didn't even discover the MIDI aspects of it until years later. I used Acid for drums and loops and Audition for audio recording. I gave up on MIDI (because I didn't know Acid supported it...perhaps earlier versions didn't in all fairness). It was funny that I gave on MIDI...since I go by Midiboy.
I tried other things like Cakewalk. (No offense, but I didn't like it...probably because I didn't want to take the time to learn an entire new interface that was 100% different than Musicator). Someone I knew swore by Cakewalk, and he annoyed me, so that probably had a lot to do with it as well. I didn't want what he used because he annoyed me.
I loved Audition and Acid together, especially when I discovered RE:wire technology. I recorded 4 albums with that combo. Most people were extremely impressed with the recording quality. Even got a review in Rolling Stone for my first major release.
Then I discovered Native Instruments Komplete. I bought it, not knowing the depth of the MIDI capabilities of that software. Guess what Adobe didn't like? It's MIDI implementation sucked (for lack of a better word). I found out how to use MIDI in Acid, and it was nice, but cumbersome and it wasn't the most stable at times. Especially when Windows 7 came out. Acid Pro requires Dot Net 2.5, which isn't supported in Windows 7. Sony dropped support for the Acid Pro line and barely supports their Windows 7 compliant 64bit Acid Music software.
I officially in the market for a new DAW again. Keep in mind, if you are not an Adobe Audition user, it is really a great piece of software. It's logical. So my new DAW had to be logical as well. I tried all the software that had demos. A friend of mine said to try Sonar X2, and I told him that I didn't like Cakewalk (sorry again) and he said that I needed to try it anyway. So I did.
As much as I didn't want to, I loved it. They got the interface right! It was amazing. Everything made sense to me. In fact, the sales rep at Sweetwater told me that several of his customer switched from Cubase to go with Sonar. Cubase...it's an industry standard in EDM music. That sealed the deal for me.
When I went to buy, he told me to hold off because the pre-order for X3 was coming in a week or so, and that I should just get that instead. So I did.
X3 took everything I liked in X2 and made it better. I loved it. Recorded almost my entire next album in it. (With the exception of 2 tracks that I had already completed in Acid / Adobe).
The SPlat was released. I loved their new pricing model. I have loved all of the updates. I loved the logical interface. I recorded my entire next album in that, and am about half way done with my current album in SPlat.
You've got a customer for life. I, for one, am thankful that your interface changed. I'm all for change if it makes my workflow better.
I actually used SPlat a few weeks ago to score my first television commercial as well. Loved the fact that I could load the video in it and score it in real time.