Yamaha calls their YPG535 key action a graded soft touch keyboard and that would be true. It's very easy to press the white keys (except for the black keys which are much harder to press because of the stiffer spring mechanism), and that is not what you want if you are interested in developing good piano playing habits and skills. Not only is the key action not a good one for duplicating an acoustic piano touch, but the key polyphony memory (especially useful when playing larger passages of music or layering instrument sounds together) is a low 32-notes which is very outdated technology, but is cheaper price to produce. Normal polyphony memory these days is somewhere between 64 to 256 notes in lower priced digital pianos (under $1500). Also, if you are using the regular acoustic piano tone, it starts sounding like an electric piano as you get nearer to the top octaves. In other words, the piano doesn't reproduce a realistic piano tone in the upper octaves (it's better in the lower octaves) and that's due to the less expensive sound sampling technology in this model.
Also, the piano sound itself has minimal dynamic range (changes in the tone like on acoustic pianos) when trying to get softer mellower tone on up to bright resonate tone when playing at different finger pressure on the keys. When you're progressing as a piano student (or if you already play) more polyphony memory and better dynamic range is needed for playing at a higher skill level (above beginner level) of music including using the piano sustain pedal. The minimum polyphony in any digital piano should be at least 64-notes and the preferable polyphony should be at least 128 notes or more as it is in many other Yamaha digital pianos. If you are and will remain at a beginner skill level, this may not be an issue for you, but hopefully you won't be a beginner forever:)
With regard to the piano pedal, the YPG535 piano only allows the single pedal that comes with it to produce an on & off sustain instead of a graduated (half-pedal) sustaining of notes. This is not the way regular acoustic pianos work and so you should be sure if at all possible that the digital piano you purchase has a "half-pedaling" feature, especially if you hope to go beyond a beginning skill level. Most of the better Yamaha digital pianos do have this feature as well as other good brands including Casio, Kawai, and Roland.
The better option in a Yamaha digital piano with an upgraded acoustic piano style key action is the DGX640 ($699 discount internet price - includes stand). It has all the cool features (and more) of the YPG535 along with a noticeably more realistic weighted piano key action and much better piano sound. Although it's about $300 more, in my opinion its worth the difference and includes double the key polyphony memory (64-notes, very important). You might also want to check out the new Casio Privia PX350 at $799 (discount internet price - stand optional). In my opinion this piano feels much better in terms of the key action weight and realism than the Yamaha DGX640, it has a huge dynamic range for piano tonality, and has 128 notes of polyphony which is double the polyphony memory of the Yamaha DGX640. However, ultimately either piano would be good to own and lots of fun with many great features. But for the most realistic piano playing experience you can have along with fun educational technology under $1000, the new just released Casio Privia PX350 is definitely my top choice in a more portable instrument and it's something you can keep for many years with out growing out of it. Go here for my PX350 Review: Casio PX350 Review As a long time piano teacher and musician, I can tell you that getting something like a Casio PX350 is a much better way to invest your money as opposed to spending less on something like a Yamaha YPG535 and getting a digital piano that may not do the job.
My goal here is not to list the amount of instrument sounds, rhythms, accompaniments, recording tracks, or other extra features these pianos have because they all do a good job of that. But I want to focus on proper key action movement and piano tone quality & dynamics, which are of primary importance to me and if that's what you are looking for, I would stay away from the YPG535. Be aware that there are always people who will buy these types of pianos (like the 535) and give them good reviews for their touch and tone. However, these people almost always have little to no experience with real acoustic pianos and the way they actually behave when playing them, regardless of what they may say in their consumer reviews.
If you have little or no experience with a digital piano then the YDP535 may seem perfect for you, but in reality could create bad playing habits or hinder your piano playing growth if you use it for very long. It is fine for playing fun or for practicing lessons for a short time, but I would never recommend it to any of my piano students or anyone else wanting a "real piano playing experience." If you want or need an instrument that will allow the student or player to progress in their playing so they can play a piano correctly and adapt easily to a real acoustic piano later down the road (which is a great goal), then I would not recommend the Yamaha YDP535 for that purpose. However, if you want a fun 88-key digital piano instrument and don't really care how the keys respond or move to your finger touch, aren't bothered by the low 32-note polyphony (which can limit the playing of more advanced music), and are easily satisfied with a basic piano sound like on a 61-key Yamaha keyboard, then this Yamaha YPG535 will likely be a good instrument for you.
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