I bought a Helix and sold it because the amp models are just bad... even with impulses. It has everything you could ever want as far as hardware features but not anywhere near what Fractal has done as far as modeling.
I bought the AX8 and it really is just fine for what I wanted it for. Does it sound perfect, nope. However, it sounds damn good for what it is and it's pretty flexible.
Currently, I have 4 rigs that I can use for different purposes or for the fuck of it as is the case of the last 2.
AX8 + Rack rig with a Rocktron Velocity 300 amp and Mesa 2x12 running stereo for stage monitor.
Straight pedalboard rig and G System in an SKB PS-45 plus a small rack with a Torpedo Live and my choice of the 16 heads and 7 cabs I own.
Straight up 80s rack rig with my choice of ART SGX 2000 or ADA MP1 plus Alesis Quadraverb 2 and a Peavey Classic 50/50.
Another 80s rack with an ART DST-830 (I own 2) Rules Breaker - which I can also use the pedalboard with.
I am using the AX8 rig for practice, small venue jams, etc. I am not currently in an active working band... I jam with people here and there and sit in for a couple of different friends if they can't make a gig.