This unit is a Game Changer, if you search for a profiler! This is much better comparing with Kemper and Quad Cortex (I used them both) for much less money.
BUT, if you want to play it with a power amp (like Matrix GT 1000) and with a guitar cabinet, this is not a choice for you. I've tried almost all available monitors and linear speakers (FRFR), but I've never been satisfied and I also don't like to play with headphones. You will ask, why I don't just use guitar amps instead? I play different genre and I like the sound of different amps, but I don't want to spend 20K EUR just for amps.
Con:
So, if you mainly play with guitar cabinet, profiling technology is not for you, because you will never get the sound of the amp alone, but you will hear the whole profile chain. The algorithm that cuts the cabinet frequencies is just an approximation. You have to look for modellers, like Fractal, Helix, Hotone II etc. BTW the amps that use modelling in Quad Cortex are not so good in my opinion.
If you use FRFR, studio monitors or headphones, the profiles are higher quality compared with Kemper and Quad Cortex.
I'll stick with my Fractal FM9.