I've been a long time Samplitude user.
Wrote the English user manual for Samplitude 2496 way back in the day...
Where Samplitude really excels is hard-core slice/dice editing.
The Object Editor offers a ton of realtime/non-destructing tools to edit/manipulate pieces of audio.
Since each Object has it's own Object Editor, you essentially have "snap-shot" style automation (per "Clip" in Cakewalk speak).
The UI is different (for sure)...
Samplitude might be described as an "eccentric" DAW.
But there's a genius behind the eccentricity.

IMO, It's a great addition to Sonar...
All that said, there are some really nice updates/enhancements in Sonar X3.
You might not feel like the upgrade is revolutionary...
But the changes make hour-to-hour use of Sonar a whole lot nicer.
I have all the plugins in want/need... so I went with standard Pro X (not the suite).
IMO, Independence is a decent soft-sampler... but it's no match for Kontakt 5.