Summary: The Yamaha YPG-635 is an excellent value. There are a few things I think Yamaha could have done better, and thus the four star rating. In summary: Good sound, great keyboard, great value. The Good: This keyboard has excellent and realistic keyboard action. I played on several at a music store to see which of the various brands felt best. To my fingers at least, none of the keyboards in the price range felt any better (and even many that cost more didn't feel as real).
Summary: I ended up buying this after looking around for a month and recommending it to my Father. I was happy enough with his, and found a really good deal on it, and ended up buying one myself. This is just a really nice piano. It has a really good feel (probably the best touch feel until you jump up another level in price), the piano sounds are very warm and realistic, the rest of the sounds are all very good (some of the strings/horns aren't quite there, but come on, who...
Summary: This is a very nice piano for the price. The quality of the sound is not identical to the real piano, but it's better than any other electronic instrument I've used so far. I'm also happy with the quality of materials used, and it's very easy to assemble. The selection of other instruments is diverse and you can get very creative with it. I bought it for personal pleasure rather than for professional use, and it works just fine for this purpose.
Summary: Feels and sounds like a really good piano, especially with a quality set of headphones. Perfect for practicing on at all times of the day without driving your room mates / neighbors / family up the wall. A much cheaper and more portable alternative to having a legit piano. My biggest complaint is that after playing on my Yamaha for a year, I am now spoiled, and a lot of the real pianos that I get to play on from time to time feel / sound like absolute garbage.
Summary: My brother did a lot of research on these pianos and decided on this one. I took his word for it, and have not been dissapointed. Simple to use, and I love the quick button to return all setting to the basic Grand Piano setting. I am not a big musician, so I don't have much experience with all that it has to offer, but it appears to be very comprehensive. The keys are weighted the same as my regular piano. I wanted to get rid of the big bulky piano...
Summary: This was a replacement for our Yamaha Clavinova CLP-311 (ten years old). The power button broke and the repair places I talked to said that it can be hard to get parts for any keyboard over about 5 years. We decided to get this because: 1. It fit our budget 2. We live in a town home and need the option of headphones 3. I hope the "bells" and "whistles" make it fun for my kids to play. 4.
Summary: I bought this digital piano/keyboard several months back and I find it to be an excellent digital (recreational) piano. I decide to buy this model because it has sequencer built in it (to start composing), has quite realistic piano sounds (other sounds sound a bit cheesy though), and looks great! Its however a bit on the heavy side so if you plan on taking it out for performances, I would look to buy a true portable/stage piano.
Summary: I am not musically inclined. I bought this so that my son could learn to play the piano. This keyboard is working fine for this purpose. It has all the keys of grand piano, and they are weighted which his teacher says is important. My son tells me the keys on the Yamaha are a little harder to press than the piano his music teacher uses for his lessons. I suppose that's better than being easier to press. He has to build up his finger strength.
Summary: The other reviews cover the good points: the keyboard, the sounds, and the features. So, I'd like to cover one relatively small disappointment: the maximum volume. The built-in speakers seem decent enough, but the keyboard needs to be played at maximum volume in order to be heard. We bought this keyboard so that a parent could play along with our kid during practice. We have an upright piano with above-average projection (i.e., loudness).
Summary: I have been wanting to upgrade my keyboard for a while, and I finally decided that I was ready for the investment. I wanted to do it right. I live in an apartment, so I wanted to play a "real" piano in a more manageable way. I only did a few hours of research, and it seemed to be clear that Yamaha manufactures solid digital pianos and are the industry leader. The YPG-635 seemed to be right in my budget and had everything I wanted.