Initially, I reviewed these pianos (PX130/330) in late Nov 2009/early 2010 when they first came out. As of this writing, Casio still has the lead (in my opinion) over it's competitors in portable full size digital pianos under $1000. The Casio Privia PX130 and PX330 digital pianos are very nice instruments. They are the slimline lightweight (about 26 lbs each) models that have many things a person could want in a small, low profile cabinet and these pianos break the price barrier (in my opinion) for features & sound dynamics from very soft to very loud.
As a professional pianist, music educator, and digital piano consultant, I believe the newer 2013 Privia PX150/PX350 portable pianos for under $1000 are the best in their class. In fact, these digital pianos are difficult for many people to tell apart from some traditional upright acoustic pianos for feel and tone although the speakers and power output in them is minimal, but so are most of these less expensive portables with built-in speakers. The pianos sound pretty good for their size, but to achieve a louder, fuller sound, you would need to plug them in to a bigger home stereo system or powered speakers, or...you could use a good pair of headphones. Although there are definitely other brands of good quality digital pianos made such as Yamaha, Roland, and Kawai, you would have to spend more money and still not get many of the advanced features the Privia's have, especially the PX350.
Now that the PX130 & 330 are discontinued, the improvements in the new PX150/350 models are substantial so I would definitely recommend you take a look at those instruments rather than buy the older series even if they be new or used for less money.
Whether you are a beginner, intermediate, or advanced player, these new model pianos (Casio PX150/350) might be just what your looking for if you need something really good but relatively inexpensive, compact, lightweight, and easy to move around.
Please contact me to get more information and to find out about buying a digital piano for LESS MONEY than internet price. Email me at firstname.lastname@example.org or call me at 602-571-1864.