Love my Zebralight. Picked up a H502 for EDC. Use Eneloops mostly, but love I can chuck a AA in if I need. Very bright and great for lighting up crawl spaces. My gf even makes use of the headband when playing in the Marching Band during Dawn services.
I've had a ZebraLight as well as several other brand lights for several years. The ZebraLight is the one I always reach for. It's very light and comfortable, completely adjustable and you can choose how much light you need for each task. My go to light is the AA model, but I've recently purchased a CR123 light. They are both very light, unobtrusive and always show me the way. My Cr123 model is in my EDC pack and the AA version sits at my desk. I use these lights a lot. All my other headlamps simply collect dust. I could use a second CR123 model.
In my opinion, the ZebraLight interface is one of the best designed in the industry right now. They've steadily improved it over the years and it has instant access to hi, low settings and allows advanced users straightforward access to other levels. I love my H502w which has had EDC use for several years now but looks brand new. Well except for the clip which is pretty beat up :-).
Same I love my zebralights, the sc5w has been my main edc light lately. 500+lumens out of a single eneloop pro. Zebralight definetly has a homerun if they put the same potted PID from the sc5 into a Headlamp model. I'd be amazed if MD can workout something with zebralight, considering zebralight isnt very fond of selling their lights below msrp.