I got my Kemper on the 15th August 2012, it´s from the second batch, hence some leds are dead. But it's still the best purchase of gear in my musical life, because no other company delivers updates and improves a product that long and the KPA is still up to date.
The QC is flavour of the month and those "review" is paid advertising. Each channel has about 300.000+ subs, they released their videos on the same day. Evan when Rhett Shull that he buys the QC it's advertisement, because no one knows how much he will pay. On the one hand it's intersting that he will load some captures to QC online library, but on the other hand he sells his kemper profiles.
I really hope someone puts out a comparison between the QC and the KPA in a band situation (in a mix). I think the KPA will succseed, but I'm biased (not related to positive grid