I've used a few dive lights before and have settled in with this one for the moment after a couple buddies recommended it. What I like most is that it has different brightness settings. I often will use the lower setting in darker conditions to avoid blinding myself and to avoid scaring fish away. I use the narrow beam, but they have wide and extra-wide options too.
The light head stopped working at one point and their customer service checked that I hadn't flooded the light and then replaced it free of charge for me, so I am happy with the company's service as well as the product.