In writing about the SteamOS and Steam Machine plans laid out by Valve, I mentioned how if Valve wanted to allow PC players to game from the convenience of their couch, then they’d have to develop a controller that provided the same keyboard and mouse (K+M) input experience.
Which is exactly what Valve have shown to the market.

It may just be me, but the Steam Controller looks like it is only half complete with all that empty space. (Image Source: IGN)
It’s a smart move by Valve and the most innovative thing they’ve mentioned during their big announcements week. However, the key question remains: how well does this controller let you play PC games from your couch? If it isn’t up to scratch, PC gamers will stick the already-working-perfectly-well option of K+M at their desks and the Steam Machine offer won’t be nearly as attractive.