The blaster VI projects a beam simalar to the L4, only brighter. More of a "flood" type beam. L5 & L6 has a tight hotspot with a dimmer corona around it from what I gather. I'm not sure how the L5 vs L6 is. So look at the L4 vs L5/L6 posts to get an idea of what they look like. Keep in mind the Blaster will have the same beamshape as the L4 just about but a bit brighter.
Really depends on what you want to use it for. Me personally I'm becoming really fond of Flood type beams.