I have been underwhelmed by my food processor, but not because it is any particular brand. I suspect it works as well as most (KA). Perhaps it is because I acquired one so late in the game that I was used to doing many things without it. I know there are many who use theirs a lot and like it. For me, it seems like there just aren’t many tasks that it excels at. I prefer flaky pie crust made by hand, I’ve never been very successful with bread made in it (mine had poor gluten development), and it doesn’t work well for creating fine powders from nuts or grains.
It does seem to work pretty well for making superfine sugar and it is terrific for making ganache, I always drag it out for that. The small pieces of chocolate that it creates help ensure a perfectly smooth and foolproof ganache. It also works well for grating carrots, though I’ll often use my box grater instead to avoid the clean-up.
I also find that the plastic in mine retains odors and transfers them to sugar, so I need to wash mine by hand and avoid using it for savory items.
I agree with Sherrie that getting one with both a large and small bowl is a good idea, and I would also point out that the capacity is fairly low compared to the volume of the bowl (i.e., they need a fair amount of empty space to keep from leaking ingredients onto the rotor shaft), so go for a larger capacity.