I've been tempted more than once to buy into the Kemper thing just to see if I could get some use out of it, but I'm not sure what I'd do with it. It's basically a "sonic Xerox machine", and I don't have anything laying around that I need to copy. To me, it seems I can get the original out of the Axe, so what do I need copies for? And it's not like there are any effects missing or misrepresented in the Axe, so what would I gain?
The one thing I could see the Kemper being good for is copying oddballs. For instance, I used to own a JCM900 that sounded really sweet. I got it used, and somebody along the line had modified it and did a good job. A dead-nuts copy of a JCM900 wouldn't do, and I don't want one. I want the one I had. Also, I used to modify old Fenders to good effect. Some of those might be fun to have
I know the Axe does "Tone Matching", so perhaps I'm considering something I already have. I've not used that feature yet so I don't know.