Bright, easy to use, comfortable. Light enough that on an ultra I'll just carry 2. Or 3.
My only gripes would be that the ModeMaker app is no longer available for Mobile- only Windows/Apple desktop. And, the functionality is fairly limited. You can't create your own light combination modes, only select from an existing set. Most of which are better suited for going to a costume party as a Cylon or KITT from Knight Rider. I can make do with the available set, but there are some practical things I'd like that just aren't available.
Best lamp I‘ve ever had.
This is a simple to use and comfortable head lamp. I wanted something that I could toss into my pack for running while traveling and this one fits the bill nicely. It charges via USB-A without the need for any additional cables and I can choose which features I want to enable using the ModeMaker app: I can make it flexible or dead-easy with one mode available if that's all I need.
The silicone band is comfortable and adjusts easily while maintaining enough tension that it stays put but doesn't give me a headache like some others do.
Since this is new, I am still learning the controls as I decide what I actually need/want to have available. I generally don't mess with the light too much while I am running, so a basic config with the "boost" ability and a low-power setting are probably all I need. I can see how all of the options may be overwhelming for some people, including me. However, once I decide, stripping it down to only what I need is simple and is what I'll do.
I really like this Bilby Run 400. I've used it on a number of night runs and have had plenty of light to navigate my routes. So far the routes have been on bumpy streets that are under construction. Fits well and stays put.
I like the fact that the head lamp is detachable from the head strap. This makes washing the head strap very convenient without fear of water logging the lamp. The lamp itself throws out a lot of light while not getting too hot.