As a hobbyist, my Snapmaker is running perhaps 2-3 times per month, so no heavy usage, but I admit to pushing it to its limits sometimes, printing with 120 mm/s or so.
I do have the bracing kit, but the improvement of it is not as good as I was hoping for: DX + Bracing Kit: Flex and Z-Offset-Problem
My biggest problem is that I get backlash creeping in frequently, which means I need to retighten the sliders in the linear modules, which is always annoying as it means to disassemble the printer 80%. It yet needs to be seen if and how the bracing kit improves that.
Bed wobble I never had, but a bumpy heat bed, making bed levelling a bit of a pain, and for large prints careful observation and manual fine-tuning of the Z-offset for the first layer is necessary.
For me, the linear module design in the sliders is a bit flawed, with plastic nuts, mediocre backlash compensation and small dimensions making them prone to mechanical stress at high leverages. It seems that Artisan is more thought through in that regard, so I guess: lessons are learned 
And to put this into perspective: As I write, I still have my successes and my recipies to overcome the issues. The joy of my projects by far outweighs the unhappiness from the issues. From a 3-in1 I was expecting some compromises, and I am not generally disappointed! The “All metal” design however suggested a more robust machine, and that’s why I say I’m a bit disappointed on that front, but I do not regret buying the machine, and by now have quite a zoo of additional modules - which I would not have bought if I did not think the machine capable enough.