BrianD75wrote a review of Louis Garneau Diamond Helmet on August 22, 2012
This helmet is very high quality and has decent looks. Functionally, it can save your brain bucket from a beating which is very important. The pads are comfortable and the chin strap is decent although depending on fit, you may have some excess strap. Ventilation works very well and is primarily provided by a large front vent at the the center of the helmet. It's lightweight and is very adjustable.
A word on fit - if you are at the top of the size range - go to the larger helmet.
A word on insects - if you have bees, cicadas or other large insects, wear a headsweat or grab a helmet with mesh. This one has no mesh.
A word on fit - I don't have a round head and this helmet fits very well!