Wow. For my purposes the Fractal range is super overkill. Hell, the Helix HX Stomp XL that I just landed is even a little bit feature rich for what my uses are. Realistically, I need about five of the amp models, two or three of the cab models, two of the reverb models, two of the delay models, one modulation model, and like three of the boost/OD/distortion models...and of course a noise gate. All the rest of the stuff is where I fall into the trap of tinkering instead of playing.
That is the beauty of modeling devices...so much value for your dollar, much farther beyond what 1 or 2 amps could do with an effects array...
Many amp purists will tell you the air-pushing feeling won't be there with FRFRs, which is OK IMHO, because the volume is still there with much more.
My personal feeling is that your modeler options are so far beyond what anyone could physically own or be able to store in one space, when you can dial it all in on your computer and set up how many presets you might need for 2 or 3 songs, or an entire week's worth of songs. There's really so much to choose from, and it can be a bit overwhelming.
The key is to listen to several types of amps you might like, and bookmark color-code them. Then, do the same with a variety of cabs. You can set up a template preset that has a stock preset with scenes for clean, crunch, lead, and hot lead. Add a looper block and record a patch of yourself jamming on a brief progression. Then use the preset, and test-drive various amps through a given cab. You'll find at least one that works the best for each of the scenes. Then, do the same for your cabs.
Once your happy with a basic dry signal, you can add drive, and modulation, as much as the CPU limits will allow. With the Axe III, FM9, and FM3, the CPU limit is about 80% before it gives you a warning and shuts off the signal for overloading the circuit. The Axe III has twice the processing power of the FM9, and 4 times that of the FM3. You learn to be frugal with what effects you choose in order to save using CPU.
@RickP will tell you modeling devices can be a godsend in live situations where plugging into a PA system is better than lugging multiple 4x12s onto stage, along with their amp head counterparts. Essentially, with some modelers you can dial in 2 amps and 4 cabinets for just about any situation you might need for any given song, then with a separate preset, you've got an entirely new blank slate with which you can create more presets for whatever your needs might be.
I've currently got about 6 presets built for most of what I might use for an open-mic set. A Main Rig, then a couple presets for blues and smooth jazz ala Larry Carlton, a couple presets for my PRS HBII Piezo, and an arena type preset for reaching large audiences. There is really so much more on tap with this devices.
Tinkering becomes a way of thinking for modeler tweakers...you'll discover a lot of interesting ways of creating and building presets if you take the time to view any instructional videos posted on YouTube for your benefit. The mindset of "use your ears, not your eyes" actually helps you choose what sounds best, instead of relying on what you think you see with any given associated name or brand. What you think might sound good with one amp may not sound good with another, so that's where it pays to use your ears.
Regards the world of modelers, think of the time and energy you'll save lugging a small floorboard and a floor monitor, instead of an amp head and cab. As we all grow older, we look for more efficient ways that help us cope with the everyday aches and pains we might experience, and try to think of ways we can prevent hurting ourselves unnecessarily. A floorboard unit is much lighter weight than an amp/cab, and if the venue already has a soundboard mixer to plug into, you've solved part of the problem of being burdened with too much weight.
Best wishes. May your efforts prove fruitful and may you enjoy your modeling device.
