So, I just saw this special and am wondering if it's worth the upgrade? Anybody using the Breverb full version and have opinions -vs- the Sonar version?

depends if it's locked to sonar.. then it's no use to me.. if not , maybe
 
 

The full version is the same version sold by Overloud. It is not locked to SONAR.

I have three primary reverbs - Breverb (full version), two Valhalla offerings, and the TSAR reverb that comes with the Softube Mix Bundle (ProChannel add on). I use them all a lot. I really like what Breverb sounds like. It has a very good selection of presets. If you check out Breverb on YouTube you can see some sample videos from Overloud that really help show how good it is. For $79 it's great for sure. You can get one of the Valhallas for $40 and it will provide an excellent reverb by itself. I prefer having more options. I end up selecting Breverb and the TSAR more often than not.