the keys move more like a real piano with some brands and models doing a much better job of that than others. The Williams Legato is a keyboard in the sense that it has what all non piano weighted keys have...unweighted spring activated keys. Their are no "weights" in or on the keys. The springs under or on the back of each plastic key have a certain amount of upward tension just like real springs have. Try pushing down on any spring (depending on the size and strength of the spring) and it will take a certain amount of downward pressure to push that spring down to overcome the upward resistance or tension of that spring. Springs want to stay at resting position and if that spring is pressed down, it wants to pop back up immediately. The more the upward tension/pressure and resistance there is of the key from being pushed down, the more pressure it takes to push the spring down in the first place. Simple physics actually.
Legato case is also fairly attractive, comes with a metal music rack, and has some cool aluminum/chrome looking buttons to push and things are laid out on the control panel in a pretty intuitive way. The editing functions must be done by referring to the owners manual because there is no way to know how they work from the keyboard itself. However, those features pale in comparison to what you can get with a new Casio or Yamaha keyboard which blow away the Williams piano in nearly every way including having access to internal educational and recording features, especially with regard to much improved key action and piano sound in my opinion. The Williams piano sound is somewhat digital toy sounding through the internal speakers but does sound better through headphones or external speaker system, and the keys are noisy when going up and down but that is sometimes true with other low priced digital keyboards too.
If you want more info on new digital pianos and LOWER PRICES than internet discounts, please email me at firstname.lastname@example.org or call direct at 602-571-1864.