I got mine since 3 weeks now and I have been playing way past bed time for most nights... I own 3 tube amps but I just couldn't play those anymore. Mainly because of my baby son but also because I just don't want to sit next to a super loud amp anymore.
Once I realized that, it was just about finding the best possible sounding solution out there. I looked into most of the available products and the Kemper definitely sounded and feeled best. That is to my ears of course
I don't require a lot of effects. A good reverb, a delay from time to time, some modulation and that's pretty much it. The only exception is Pink Floyd of course. I can say that the Kemper is amazing for Floyd stuff. There are some good commercial Floyd rigs out there.
So being able to have all of that in one little box convinced me.
Like you, I also was afraid of buying an "old" piece of gear. But as Chris Duncan mentioned in this post, this thing was overbuilt. I confirm that it feels like an absolutely up to date piece of kit. Plus, you get all the free updates. Think about it... It's been more than 5 years that the company offers free updates. And that's not only bug fixes! It's new delays, new reverbs... I don't know a lot of companies that support a product for that much time!
Lastly, one of the brilliant things with the Kemper is the fact that the users are actually creating new content. If you have a modeling device, you have to wait for the company to add a new amp. Here, the users are free to do that.
I can only say that I would buy it again in a heartbeat and that I should have done it much earlier.