The katana works but, you cant run the cabs with it. So you lose that next level of detail you get from the IR's. the Katana is very loud - I used the 1x12 100 watt version. I gigged with the Katana and an FM3 and loved it. The open back of the Katana worked great for me but, im blues classic rock guy. If you are low on funds - i think the katana is a great fill in but, in the end for me - the katana is my back up (another plus to the Katana If your Fractal dies on the gig). I love the EV's sound, built in EQ, volume, great company and warranty - its fantastic IMHO. If you just get the Katana you'll be very happy until you play the EV - that's what happened to me - I've tried everything and settled on the EV but we're all different.