Excerpt: This review takes a look at the Yamaha YPG 635 also known as the Yamaha DGX630. Last time I checked, this 88 key portable grand keyboard was being sold for about $899.95 online. You can get a used one for less. The first thing I liked about the Yamaha YPG635 was its looks. I liked its wood accents and matching wood stand. I think looks go a long way in giving you the vibe you need to want to play your instrument regularly.