I upgraded from Yamaha yfl-212 after ~1 year of playing.
I checked the instrument with my teacher - everything was perfect except one key that needed a slight adjustment. The key adjustment was so trivial that the local shop fixed it for free (Thomannmusic was ready to cover the cost though).
There is a huge quality difference compared to my old flute - the sound is more beautiful and full in all registers. I feel way move confident when playing in both high and low registers. Articulation is way easier too (especially in low register). Keywork is smoother and more precise.
Overall I have a feeling that this instrument helps me achieve more. It's fun to play it.