I came to CPF for the sole purpose of finding the best flashlight for use in photography. The McGizmo lights, specifically the Mule and Sundrop models, are essentially the only flashlights made with photography in mind. The McGizmo 1/4"-20 clip, something that no other light has, made McGizmo the only real choice. Last freaking thing I wanted to do was spend $2,000 plus in flashlights, but, now that I have, there are no regrets. What I love is being able to attach my flashlights to clamps and stands and then toss them into a bag. Drop the bag. Throw the bag into the back of the car. Everything banging against each other. Toss bag under the stage. Just doesn't make any difference, no amount of abuse stops them: the McGizmo lights always work.
The only reason not to buy a McGizmo is price. But, that doesn't really fly either. After all, the resale value for McGizmo lights is about 90% of the original cost! And, over time, the McGizmo lights will go up in value.
I read with some interest a comment about using the money to buy a nice camera lens instead of buying a McGizmo light. Interesting since that is the way I justified to myself going with the McGizmo lights (the cost a good pro Nikon lens starts around $1000 and it goes quickly up from there. I have a number of lens that each cost well north of $2000.) After that, McGizmo lights are just another tool in my photobag. No big deal.