Good Machine
I've owned the Casio CDP 220R for about a month now, which is about how long it has been released in the US market. I was initially considering a Privia PX 330, and I had a chance to demo both. I also tried the Yamaha P95, and a few other entry level units in the showroom, and I just really liked the Casio sound. As far as the sound between the CDP and the more expensive Privia, I could not hear any discernable difference, although the Privia supposedly has a more advanced sound source and keyboard. They both have stereo Grand Piano samples and although nothing can compare to the sound of an acoustic instrument, they were both very pleasant to hear and play.
As far as bells and whistles are concerned, I think Casio outdid themselves in the 220R. The tones are really incredible, and I honestly didn't think it mattered before I bought it. The Lesson mode is very useful if you have some basic music knowledge, and I learned to play Moonlight Sonata in less than two days using the program. I like how the screen also shows on Staff what note you are playing, which helps beginners learn to read music. The layer feature is great, too, and layering the Grand Piano with Strings gives it a very big quasi-orchestral sound. You also have the ability to split the keyboard, which I really don't have any use for, but it's there if you need it.
As far as the bad- there are a few: First, 48 note polyphony. I really don't think it would have cost too much more to add a higher polyphony capability for this keyboard, but I guess you can't get more with what you pay for it. 48 notes may sound like more than most people will play at once, but remember that when you use the stereo GP, each key counts as two, bringing that number down to 24. When you layer the sound, again, it counts against the total polyphony sound as well, so you're basically down to 12 note polyphony. Also, Unlike the Privia, which have jacks to allow for all three pedals, you only have one jack for Sustain. The speakers are also pretty weak, and are not adaquate for most medium sized rooms unless you are practicing by yourself, so I have it hooked up to an amp through the 1/4 inch output. The pitch bend wheel is useless, the metronome can't be turned down if you want to use it, and some of the functions are kind of hard to access without using the instruction manual everytime.
However, I still consider this digital piano best in its class. It sounds and feels great, it has a ton of features that you will not find in anything remotely close to this price range, and it is a beauty to look at.