For me is very positive, the battery adapter for the Sony FM500H which I have of the A900 and A77 repeatedly available.
++ Brightness
++ Infinitely dimmable
++ Gold diffuser and green filter diffuser attached
Available ++ Sony Battery Adapter
+ Fabrication of case
o Quality Stand
- Tilting mechanism stiff
All in all, "must" is in the price not complain too loudly. High-quality processed solutions cost equal to three times.
Thumbs up.