All Nationalism aside.......
Compared to using a tube rig (IMO, no need to compare it to anything else), it is more versatile, cheaper, and sounds/feels like a tube rig.
The pricing appears to fit in very well as part of a pro stage rig. And, the non-powered version's closest recording tool competitor is more expensive than the Kemper.
(using Thomann website prices)
If a Marshall JVM410H is 1390 euros, and a Fender Super-Sonic 60 Head BK is 1265 euros, that is only six Marshall/Fender sounds for 2655 euros, with power amps, but no effects or cabinets.
That is 600 euros more than a Kemper power head, and 1100 euros more than a non-powered Kemper.
Add 655 for a Marshall 1960 cabinet, and 574 for a Super Sonic cabinet, and the "six sound" total is close to 3900 euros ( I have no idea about VAT, sales tax, whatever it is in your countries). Still, NO effects.
3900 - 1555 = 2345 euros. I'm guessing that would be enough for two powered CLRs.
3900 - 2055 = 1845 euros. That would be more than enough for two non-powered cabinets.