If you use Native instruments plugins, the Komplete Kontrol is likely worth it.
If you don’t, then you can probably try something else.
The integration of whatever sliders/knobs CC senders exist on the keyboard is likely to be the same between brands, and the same thing for transport controls, so what other integration are you looking for?
I don’t think anything else does the level of “pick an instrument, and display parameters on the controller itself” fanciness that the Komplete Kontrol does, and it only does it for the NI plugins, not for other things.
Not totally true: any plugins you add to the effect chain can be controlled from the Komplete Kontrol keyboard too. Of course only NKS compatible effects show up, but a fair few do including Arturia, iZotope, Waves, Eventide, NI, and Softube. From within the software you can add even more, but the amount of control you get over these on the KK varies from almost none to most major controls.
I can’t compare to other MIDI controllers other than my Roland A800 Pro (which is a more basic MIDI controller), but I like the Komplete Kontrol a lot. The ability to quickly browse through lots of presets and audition them quickly , then hit record on the KK and start recording in Cubase is quite powerful. Enable metronome, loop, punch-in, record quantize, navigate tracks, mute, solo, undo and more are available functions on the KK.