I bought this light due to the limited handlebar space on my Roubaix. The light sits centrally under my out front Garmin mount. In terms of size/form and positioning it is just about perfect. Light output is good and the casing doesn't seem to get very hot, even when stationary at full power. The light has 2 LEDs, one gives a narrow beam and the other a wide beam. The two beams work well together, but only one of the 4 modes (full power, 900 lumens, 1.75hr burn) operates both LEDs at the same time, which I initially found quite disappointing. If you want to operate at low power you have only 2 options: low spot or low wide (5 or 6hr burn, 300 lumens). That is, both of the low power modes only operate one LED so you get EITHER spot or wide, not both. The remaining mode is daytime flash which I will never use as it seems a bit over the top. There's a nice big power button on the side which is easy to press. The light comes on in the same mode it was turned off in, which is great. The mount itself made me quite angry, I have to say. I found it quite difficult to get the locking lever in place initially but I got the hang of it in the end... which is lucky because it took much unclipping and clipping to get the light in the perfect position. Fine tuning of the light angle must be done by unfastening the mount, swivelling it and refastening (because the light clamp can only be adjusted in increments of 45 degrees). Then when the locking lever is clipped into place it moves the light position slightly, so getting it right was a nightmare. I can't understand why the mount doesn't just have a simple allen bolt attachment instead of a 'quick release'. Who takes their light mount off the bike once it's fitted? That would mean repositioning it each time and why would you want to keep doing that?. Also a bolt attachment means it's more secure. Anyway, it's on now and it's a good light that I hope I will enjoy for many years. I just hope the mount doesn't get stolen.