I've been playing bass two nights a week for 17 years (4-string), but I also gig on guitar. I bought the Kemper for guitar.
I've profiled my TC RH450 and my MarkBass LMII bass amps with good results. Each one sounds like the respective amp. So if you're thinking of having your amp collection with you, and adding effects as a bonus, the Kemper could be for you. But once you can readily switch between them in the Kemper, you may find you really only like a few or even one of your amps. This happened to me with my electric guitar amps, which I've all but sold now.
One downside is I have thousands of profiles of probably hundreds of different guitar amps...but only probably 5 bass amps, two of which I made myself. So the user/profile base of the Kemper is much more guitar oriented. There aren't a lot of bass amp profiles out there.
I recently sold my CLR (which I used for guitar). There is no way that could cover bass duties in my various bands. My bass rig is the amps I mentioned and TC RS212 and RS210 cabs. Other than a festival gig, I could cover anything with a RS212 and the LMII, which together purchased on the used market is less than $700 (US). So cost is another factor. You'll pay a premium for something that is more useful for guitarists.
To be clear, I LOVE my Kemper, and sold a wall of boutique tube amps because of it.
But it doesn't go to my bass gigs, which are in smokey roadhouse bars, or outdoor tiki bars. I value it too much. I can get a wide range of tones out of a $300 (used price) Mark head. I've very happy at the gig with that.
But Bass is your main thing, and you (possibly) want the best. And the Kemper really shines if you're a person that likes to tinker...mess around with effects and tones. The user interface is wonderfully easy (some people will need to break out their cheaters (glasses) to read some of the fonts). If your friend would profile all of your amps for you in his studio, that would be a great bonus.
Some of my "turn on the bass amp and go" friends would hate it. I'm sure you know if it would be right for you in this regard. There is a learning curve for some. I've found it to be a breeze.
Some FRFR speakers to check out would the Yamaha DXR15 (which I haven't used, but heard great things about) and the EV ZLX-15P, the latter only weighs 17 kg. I have the 12P which sells for around $335 US (dealers will discount these below MAP) and it is a great value. But I haven't tried these speakers at my bass gigs.
Best in your search!
Scott