I play five strings tuned to Drop C and the Kemper does just fine. Picking and plucking, it sounds just as real to me as playing through any backline amp I have gigged on. Not sure how it compares in 'feel' compared to an all tube head, but my Laney Nexus tube will make it to our new practice space real soon for an A/B comparison.
The Kemper is also wonderfully straightforward to use and dial in if you are a 'simple' bassist. Plug and play, tweak the bass/mid/treble to taste. Minimum reading or youtube watching to figure it out.
But it also offers some amazing deep dives. I always parallel my signal, do different cross-overs with distortion patches, alter EQs, etc, etc. This takes more time to figure out how Kemper works, and it has a few shortcomings that I personally noticed (inflexible parallel signal injection along the signal chain, no multiband compression). If you can live without these, no worries, but if you like to tweak and tinker, compare thr Kemper with other modellers out there figure out what you need precisely.
For me the Kemper made sense because I track bass, guitar and another guitarists guitar in my apartment studio. Now we have profiles of our amps, making the process quieter and more streamlined. Another win is to use guitar amps as distortion engines for bass, which I am just starting to dive into, instead of relying on the Kemper's distortion pedals, which are just OK.
Now for the really fun part. Another guitarist in my band has a Kemper so we can actually profile OD/distortion pedals as well. Another step to digitizing the tones we already use and love instead of using someone ear for the tone we want.