I've had my Helix for almost two years now, and I'll go on record saying it's the best amp-style purchase I've ever made. It sounds great right out of the box, and if you load some good IRs into it, it sounds even better. The models are as close to having a real tube amp as I've come across yet. The touch response is fantastic, it cleans up "right" when you roll down your volume, and the signal path options are practically endless.
Now, I haven't ever tried an AxeFX, so I'm not qualified to compare and contrast the two, but I can honestly say that there hasn't been a single moment in the past two years that I've regretted buying my Helix even a little bit.
Enjoy, man! :rock-on: