I'm really excited (and somewhat nervous ) as I have a Kemper on the way! Should be delivered tomorrow. This will be a good weekend!
I've owned an Axe FX II for about a year and a half. I've always been fairly happy with it but over the last few months I've really been impressed by clips and videos in which I've heard the Kemper in action. I've already read the manuals and downloaded a lot of rigs from the exchange, as well as a few commercial ones including the Amp Factory. I think I'm ready to dig in.
My main complaint with the Axe is that I just spend too much time tweaking, which can be fun, but at other times it can be incredibly frustrating. I'm sick of tweaking and want more time to play. One of the big negatives about the Axe is dependence on IRs. I've never felt that the stock cabs in the Axe were that great. There's only a handful that really work for me and I find they require a lot of EQing to sound decent in a recording. I've spent way too much time trying out various IRs (both free and commercial) only to be disappointed, generally speaking.
I really like the idea that a rig is a combination of an amp, cab, mics, etc. These elements are specifically chosen by the creator of the rig to arrive at the intended tone. For the most part, I figure that I'll audition rigs and if I like 'em...good. If not, I'll move onto a different one. I'm not against tweaking to a certain extent but I've had it with spending hours starting from scratch with the Axe trying to "build" a tone from the ground up. I think the modeling in the Axe is awesome but it's the cab (IR) that makes up a huge chunk of your tone and that's always the stumbling block with the Axe. In the end, the Axe with all its complexity and massive feature list, ends up being limited by IRs.
Don't get me wrong, I've gotten some great tones from the Axe and it has some features that I really like. But, if I can get results easier with the Kemper I'll be a happy camper.
By the way, I'm mainly a high-gain metal/hard rock type of player, though I do enjoy playing a little blues and jazz fusion as well. I found it fairly easy to get a good 80s metal tone with the Axe, but for modern high gain sounds it was a different story. Not only did the dependence on IRs make things too limiting, I've always felt that there's always been something lacking with most of the super high gain amps in the Axe. They seem to have too much of a "stiff and artificial" feel. I'm hoping the Kemper will be different in this regard as well.
Anyway, looking forward to trying it out and being an active member of the forum. I'll be sure to offer my thoughts after I've had a chance to work with it a while.