This is a solid app. It works as advertised and the response to key presses is quicker than expected. However, replicating the crappy wdtv remote exactly means that it fails to take full advantage of the touch capabilities of the iPhone / iTouch. It would be great if they could follow a similar model to the Remote app for the Apple TV where you can simply use swipe gestures to control the device. This way you dont have to look at what youre doing. With this app you always have to be looking at the iPhones screen to make sure you are pressing the right button. Otherwise its a good app, especially since you can type using the keyboard on the iPhone I stead of using the onscreen keyboard / d-pad.
SnipsOrtega about WDTV-Remote, v2.5