The Riff Rocker pitch was intriguing: a cheap little USB guitar peripheral that actually ships with the open-source Guitar Hero clone Frets on Fire. Pretty cool — except the $20 peripheral is really just not a good piece of equipment and worth, at most, a buck or two.
The controller is two small to easily hold in two hands and the narrow neck makes the fret buttons difficult to strike. It doesn't feel anything like playing a standard-sized guitar peripheral at all — let alone a guitar.
The tiny little rocker switch that serves as a strum bar is difficult to flip back and forth. The cord is only about three feet long, which means you'll have to be seated right next to your computer. At that distance, why not just use a keyboard?
Consider Frets on Fire ships with only a couple of songs — let's face it, it's really designed to be used with copyright-violating packs of pop songs with fret patterns programmed by fans — there's really nothing much left to a Riff Rocker owner except frustration and a desire to play with a full-sized (miniature) controller.
Riff Rocker project page [Riff-Rocker.com]
Related • Make a Guitar Hero Kit for your PC for $30 [Instructables]