My latest gig with the FX8 was Saturday in front of 220 people. My rig sounded killer as ever! But that's mainly about the guitar/amp/cab. The FX8 is really just the icing on the cake.
FX8 is just, of course, a box full of FX models. The way I evaluated was to compare, one-to-one, each effect type to my favorite stompboxes of every effect I use. Fractal's models, in every case, are equal or superior for me. I knew that going in, since I have an Axe-Fx too
The verbs, delays and time based mod fx are way better than anything I ever owned in stompbox form. I still have some very nice drive stomps, and I was slightly iffy about the Fractal ones in comparison.. until G3 update happened. Now the G3 drives are perfect, I only wish there were a few more of them to choose from.
So in terms of sonic capability I have no compromise, only improvement in most cases. Add to that the value of zero-noise routing (compared to physical cables), presets to save multiple routings/settings and just having a whole high end pedalboard in one sturdy box. I love it!