I have had a pair for over a year. Pros: Very bright, not over-rated like many others. Long battery (40 mins at 4000, and hours at 1000). Good, even beam spread. Very simple operation and clear LED scale for power level and battery status. Built like tanks. Lots of levels making manual video exposure much easier (set the camera, and adjust the lights).
Cons: A little big, but this is a trade-off for the big long lasting batteries. Heavy on land re handling at the end of arms, but neutral in the water and easy to handle during the dive. More expensive than others. Charging time is long, almost three hours from dead to full.
Overall, the pros FAR outweigh the cons. I consider these to be worth every penny. I shoot mirrorless and often switch between photo and video during a dive. At the end of my arms, I use triple clamps with a strobe and one of these on each side. Easy to handle and gives incredible versatility.