negative:
you can not turn off the power! Though it is a kind of standby, it is, however, in a camera bag with other accessories (filters, batteries, etc) is always something on a button, and he wakes up => the batteries are empty soon!
But the price fits in any case!
update:
I now use it for a few weeks for astro-photography which I arrived at the exposure times thereby required to inaccuracy: the exposure time is always longer than the selected! 60 seconds it will illuminate 61, at 600 605 which although not a major drawback, however, is still annoying!
