I'd actually considered the 150 to fill in the area directly in front of my front wheel. I wanted something with conventional AA batteries, though, so I went with a Planet Bike Blaze 2W for that application.

I've not used/tried the 250, but the photos I've seen of the beam lead me to believe that it's fairly similar to my Dinotte 200L. It sounds counter-intuitive, but I actually prefer the German lights that put out less "raw" light. I've done some back-to-back testing with my Dinotte and IQ Cyo, and I prefer the latter. The super high-powered lights seem to "spill" a lot of light, and my eyes prefer a less intense beam that's a little more "focused." That's for pavement, however. When I ride off-road (read, singletrack), I definitely prefer super-bright lights like my Amoeba (bar- and helmet-mounted) units. In those conditions I actually want the light to illuminate more than the 40'x10' in front of my wheel.

Sorry I couldn't be more help.