I'll be buying an FM9. Mostly so I can see a
@Marco Fanton preset not tickle the red. Kidding Marco! Love your presets, buddy!
In all seriousness, it's mostly the additional power. I've considered an Axe FX 3, but my needs are pretty modest. I'm not trying to duplicate Frank Zappa's signal chain or anything. The FM3 meets my needs pretty well, but as a home player, I don't really work from a "preset per song, scene per section" paradigm. I choose a preset that fits what I'm playing and switch effects in and out as needed. So I like the idea of having a couple more blocks available to play with. I also like the idea of Ultra-High quality reverbs without worrying about CPU--though that's really more in the realm of nuance to me.
While I'm not counting on the updated Pitch block making it to the FM9, there's arguably a better possibility of it happening than with the FM3, due to CPU. And this may prove to be true of other things in the future. None of them would probably be deal breakers for me, but I'm sure I would enjoy them.
I actually don't care much about dual amps--for my own presets, anyway. And I don't know what I would do with 2 reverbs. But I'm sure others will create presets utilizing those things that I will really enjoy.
I used the FM3 with an MC6 for a while, but didn't really like the limitations with midi interactivity between devices--the MC6 not knowing which effects were on when a preset is loaded, for example, so effects state toggles were not accurate. When OMG15 became a thing, I moved up to the FC12. I was afraid it would be overkill, but I'm so glad to have the extra switches. I could have just used the FM3 alone, but I enjoy it more with the FC12. So I could sell the FM3 and FC12 and be within spitting distance of the FM9 cost, while downsizing and increasing DSP. That works for me.
I don't really think I'll have trouble getting used to 9 switches as opposed to 15, but I could always keep the FC12, too, if it proves to be that useful. I'm not really worried that the bottom is going to fall out of the FC12 market any time soon, so holding on to it for a while is still kind of just money in the bank.