Recently I found myself wanting either a Kemper or Axe Fx II and doing all the research and listening to sound samples that so many people have done and posted about.
This won't be a long review - I just wanted to encourage anyone going through this process to try both if possible in your home for a week or so at least before making your decision. No amount of research in the world can compare to your own trial. No time trying anything in the store can compare to trying it at home with your own guitar and peaceful environment.
In my case, I had my heart set on a Kemper but actually found the Axe Fx was the unit I preferred once I had a chance to compare the two. That doesn't mean I am saying one is better than the other, but for me and my taste I have made my choice with confidence - and I am excited about moving forward and where this new purchase will take me.
I would like to give insight on how to perhaps approach this. I decided the evaluate the Kemper first because if you order through Musicians Friend or any site like that they typically give you 45 days to evaluate where Fractal only gives you about 10 days. I will say too I got a much better deal on the Kemper - I got the amp head version with the power amp built in for $2357 with no tax and free shipping. Watch for those 15% off deals and learn to negotiate - these sellers will try to fool you but they can apply it to anything - put on your poker face and bluff if you have too. When I placed my order with Fractal for the Axe Fx II XL - I didn't get any discounts and they even made me pay $30 for shipping. No wonder they don't go through normal distribution channels.
Keep rocking dudes. Take opinions as opinions. Realize there are 1000 or more variations to recorded tracks and videos you try to use to compare. These units get updated constantly - one major firmware revision jump can essentially give you an entirely different unit tonally. Do your research and learn your unit ahead of time to maximize your time with it and compare things you like and you choose which one works for you. Compare side by side if you can - don't try to remember what the other one sounded like - be able to A/B them.
It sure is an exciting time to be a guitar player. Just imagine what some of your iconic guitar heroes did with what they had - and what they could do with one of these.