I used my Axe-FX-II and created my own IR's of the cabs/speakers I own and use years ago. I also grabbed Cablab and used it to mix them.
Using these in the FM3 now, still satisfied. I bought a cab pack from fractal (5153 one), and G12-65, V30, G12M from Celestion, all 412 packs... My own IR's were more to my liking so I've stuck with em.
If you have a traditional amp/cab/speaker rig you really love, and own a II or III, rent some quality mic's or book a studio with high end mic's for an hour and shoot your own IR's with your favorite mic placements. Once you do this, you will wonder why you ever bought an IR pack.