I like the Cygolite products, too. I have a Streak 350 which is smaller than a Metro. I don't use it often, as the bike I ride regularly has a dynamo-powered light. Cygolite's steady flash feature is really good, because it's on all the time, which lets me see. And the flash makes me visible.

I like the Cygolite's mount. It goes on quickly and really tight, because the bolt is long and locks into a spherical indentation and the nut is long enough to get a good grip on it.

Cygolite is also a nice company. They make their products in the USA, and customer service is excellent. I used it once.

But with that said, my German-made dynamo powered light is a lot dimmer, and honestly, it's sufficient for me. And it doesn't have a flash feature, and I haven't died yet. I don't know how many lumens it puts out, but it might be well under 200. One reason it works is that the German-designed lights have specially shaped beams which spread the light out in a deliberate pattern without wasting light where you don't need it.