This was the keyboard ( instrument with Pianoteq 4) I have been waiting for!. When playing the upper keys there is 'just' enough room so as not to hit the back, this requires a good technique but not 'an issue!?! ( Mozart and Beethoven fingering here). The key surface(s) are a good and the weight, balance and speed are 'there'!!! The three sensors allow a 'no stress ornament and trill situation' for the perfectionist. This is my new 'instrument'. Thankyou Thomann and your team! ONE YEAR ON ...AND the keyboard is going strong with no failure to any of the keys at all. After my first review above I have settled down and can be more balanced here. There are small niggles that many uses have stated, the curve top is something that can be worked around using larger rubber risers for example, and the music rack is best replacing with a floor stand, the rack, even if it was made better is too low for sight reading anyway. But back to the keyboard, and this applies to ALL similar products(inc digital piano) the action does not become lighter when using the sustain pedal as on an acoustic, obvious point but be aware if you use the pedal as a comfort to make playing easier, it WILL NOT do that on this(or any)master keyboard. With that mind I would say the action is of average weight. Overall a very good product.