I had the Brother cs 6000i, a really great machine, my granddaughter in her twenties also liked it so I gave it to her.
I did start off a younger granddaughter, about 8 yrs old at the time on it but she is a pedal to the metal girl so she had a problem, she was just too rough for it, more her fault than the machine's.
Then I tried her on the Janome Jem Silver (ASG Anniversary machine) same as the Janome Jem Gold, a perfect fit. The machine is simpler, study, very easy. She did well on it, still loves sewing & going to Stitch Camp with me (she is now almost 14). I can't recommend that super machine enough, love it. The Necchi Travel Mate is also the same machine, made by Janome, love that machine also.