I've had many affairs with other software, but it was totally consensual and besides, I always came home to SONAR. I do go clubbing with Ableton Live sometimes, but that's cool because SONAR and Live are friends. In fact I've come home and found them rewiring a few times...not that there's anything wrong with that, of course.
The reality is there's lots of fine software out there but it's all different. Different tradeoffs, different strong points, different limitations. Unlike some people I never felt it was the obligation of software to meet my expectations, but
my obligation to find the software that came closest to doing what I needed. SONAR has been doing exactly that for me since 2000, so yeah, I'm a fan.