Absolutely incredible lightning! You can turn on the ceiling how high it is, and lasts (almost) infinitely far. Loading up cruelly quickly with rechargeable batteries.
Many + for quick-mount compared with screw mount on the cheaper flashes.
The only thing - is the size, but there have to live with.
A tip: Do not at maximum power and accidentally blinding yourself. I did, and it took 2 hours before everything stopped flashing before your eyes.