Just so you know, the Suzuki company produces the HDP piano - $899.99 internet discount (above left pic) under four other model names including the M22, SW27, C11, and R21. The HDP model designation is marketed and sold by Costco on-line, Sams Club, and a few other on-line sites, and the other identical models are available at different retailers depending on who they are. However, all models are identical in their specifications and appearance. Suzuki does this to give an advantage to certain on-line & consumer and piano stores so they can have an "exclusive model number" for themselves. But all model numbers play and sound the same.
Good velocity (volume) key response means that the volume of the piano sound plays evenly and gets progressively louder or softer depending on how hard you push on the keys. After playing these pianos I noticed the Suzuki HDP has a problem in this area. The response is very uneven and jumps up and down in volume when playing the keys instead of smoothly changing volume in smaller degrees as good acoustic pianos do. Simply put, this would likely be due to lack of good electronics/key sensors in the piano. Suzuki uses the same key action and basic electronics in all their pianos up and down the line including their digital baby grands so the results are unfortunately the same in all models.
My favorite saying is that "you cannot judge a book by its cover" and that's true for pianos. The Suzuki digital pianos overall look attractive (most of the cabinets that are in the basic dark rosewood color also come in polished ebony for more money) and sound OK (nothing great compared to the other brands) and can even be price competitive for what they "seem to offer," but the reality is they do not come close to playing at all like real acoustic pianos of any type. And Suzuki's selling prices are really not that low and actually higher priced in some cases than the better brands.
By the way, I really did want to like these Suzuki pianos, but unfortunately could not. I have also reviewed in detail a couple of their other Suzuki models in the past which can be found on the following links:
Suzuki TSI-1ei Digital Piano Review
Suzuki MDG100 Micro Grand Piano Review
Be sure to check out some of my other blog articles on digital pianos from the "big 4" piano makers especially the newer lower priced Casio PX780 & PX850, AP250 (pic above left), as well as the Kawai CE220, Kawai CN24, Roland FP7F, FP4F, Yamaha P105, and Yamaha YDP162. They are the better ones in their class for the under $2000 price range right now in my opinion and are recommended by teachers, players, and myself included.
If you want more info on these pianos and lower prices than internet discounts, please email me at firstname.lastname@example.org or call direct at 602-571-1864.