Casio stepped up on this one
I've owned several boards over the years including Korg, Ensoniq, Yamaha and Roland. I never thought of buying a Casio because I remember if you owned a Casio back in the day, you were laughed at. Well, times have changed and technology has also. Casio delivers big in this keyboard. I would call it a Piano-board because of the astounding job Casio did with the feel and sound of the board.
I paid way more for the other boards I mentioned above and not one of them has piano keys like these. Casio did their homework on getting the "feel" of an acoustic piano on this board, and the default sound does not disappoint. The keys on the left are the heaviest and get lighter as you go to the right just like the strings are set in a grand piano. I have played "weighted key" boards before but there is something different in the way they did it that makes you WANT to keep playing over and over. For a keyboard with this type of technology at the price I paid- it is an incredible steal.
There is something funny in the way the on-board speakers are made. When playing, the sound is good, but when you hear someone else play, it sounds even better. I thought it was strange. I have mine hooked up to a mixer and amp, so the on-board speakers act as a monitor.
The board is durable, and I looked at the px130 right by it when I bought it and thought it (the 330) was better built in my opinion. You can carry it in one arm with a case or bag, which is a huge plus if you are a gigging musician.
The electric piano sounds are pretty good as well as the organs. Setup of registry is a breeze and the board also "remembers" the location of the sound you selected last in each of the tone banks. So if you switch from organ to piano, the sound you selected last in the "piano" sound bank will be displayed, which is a huge plus if you only use a certain "set" like most musicians who play live.
The only gripe I have with this board is the light grey typeset they used to display the buttons. Believe me they are hard to read in low lighting, so make sure the area you play in has adequate lighting.
To sum it all up: This board is NOT a toy. It has amazing technology that has actually caused me to alter my playing style (as if I was playing a actual grand piano). For a keyboard under 700 bucks, it is an absolute bargain.