excellent exercise, although they are problematic with some people with their wrists.
one caveat: bench press is already one of the most (if not THE most) dangerous exercise there is. it always cracks me up when people think the OLifts are dangerous. they aint NEARLY as dangerous as a bench press. consider that many people (in the US alone) die or are severely injured every year by bench pressing.
so... if you are going to reverse bench press, do it with a spotter, or preferably in a power cage.
but - very good exercise imo