Right now, as of June 2018, REI and a couple other outlets are blowing out some older model NiteRider lights like the Lumina Micro 750 for $45 and less. Good price for lights intended to be used for relatively short rides up to an hour.

I wouldn't have purchased a NiteRider at full price due to their sharp drop-off in brightness, but at the discounted price I'm satisfied with the Micro 750. I've been using it for a week and it's adequate for longer casual speed rides in the medium setting. It starts out brighter than my Light & Motion Urban 500, but dims significantly so over the same run time the L&M ends up being brighter during the final 30 minutes before both are exhausted. The result was very noticeable in my handlebar videos.

And the NiteRider comes with a quick release that's fairly easy to use after a break in and seems to hold securely across bumpy pavement and railroad track crossings. It's a little too easy to accidentally unlatch but I'll get used to it.