I have an Eversewn Hero, and the only two things I can think of that I am not crazy about have to do with the thread sensors.
It's annoying when empty bobbin sensor wont let me sew the last inch I need even though I KNOW there's at least a foot of thread left in the bobbin. And, I learned to ease fabric (like for setting a sleeve) by running it thru the machine with no thread. My Eversewn won't let me stitch without thread, so that's a more complicated and time consuming process.
Other than that, it is an awesome machine.