I have S.O.V3 Pro. I've only played with it a little (the same fior Reaper 5.0).
I have not recorded anything with it yet just getting a handle on the "mixing" aspects first. The arranger functionality has me intrigued.
I bought a one month $15 groove3 pass so that I can go through the S.O.V3 tuts before I really dive in. That was cheaper than paying $48 to own the series. I doubt I need to own the series.
I never expect to convert from SONAR but will use all my other DAWs, including Mixbus3, depending on need.