Head-mounted displays are one of those great ideas that, in practice, few people actually go for. Yes, having the effect of a full-sized TV with the bulk (and cost) of a set of chunky designer sunglasses is good in theory, but the look can put people off. Vuzix sent us their OLED-toting iWear AV230XL headset, which promises the experience of watching a 44-inch screen from nine feet away. Big-screen or big-letdown? SlashGear set to finding out.