I’ve been hearing about this light for quite some time now, with the consensus being that this is a fantastic light at a great price (especially for a SureFire light). There are two models of this light, the Plus and the standard. Both take a AAA battery to power them, but the size and output varies.
The standard Titan is shorter by a fair amount and has a maximum output of 125 lumens — which is about all you need for most scenarios where you would be using a light this small. It has two modes at 15 lumens and 125 lumens and is only $55.