Purchased this for my brother in law, who is a real brony. This Rainbow Dash plush is about a yard tall, really. Soft, colourful, and with quality lines and eyes. She looks of high quality. The best part is she stands up on her own, and is currently adorning his desk.
Since getting this, there have been other chances to get your hands on a Rainbow Dash plush. You could go to build a bear and make one. If that promotion is finished, perhaps someone is selling a build a bear Rainbow Dash online, such as eBay. Or, there were special WallMart exclusive pushes of the Mane 6 (Twilight Sparkle, Pinkie Pie, Rarity, Fluttershy, Rainbow Dash and Apple Jack) for sale on eBay. They might be on Amazon too.
Still, this plush is a great choice, for the right price. Cuddly and cute, and very displayable. Personally, I wouldn't manhandle her too much, but light play would probably be acceptable.