I picked up my Kemper a couple of months back and can honestly say it's the best bit of gear I have ever bought...and I've bought a lot of gear!!
i was running a Cornford MK50ii into a Cornford 2x12 cab and like you was generally pretty happy with that set up. When I bought the Cornford it was my dream amp and I thought I was never going to need another amp solution.
then I started reading about the Kemper and the GAS kicked in so I bought one. I honestly thought i'd try it out and then return it. However within a couple of hours I was getting the tones I really dreamt about. this was using the power amp section of the cornford so I knew I was only using half the potential of the Kemper!!
Now I'm running through a Yamaha DXR10 and this really let's the Kemper shine! And again I thought I wouldn't like this route but my doubts were soon put to rest.
ive taken profiles of my Cornford and to my ears it sounds 99% identical to the actual amp. It responds the same way when you switch pickups, lower the gain or use the volume knob on the guitar.
My band mates have commented that my sound has improved, more clarity and punch and I can also tailor my tones to the song as I play covers which is really cool and something I couldn't do before.
Of course these things are all subjective and in the ears of the listener but in my experience if you buy a kemper you won't regret it!!