When I last used this several years ago, they was a relay of some sort that started sticking on start up .... I didn't want to trust it any more! There is some value in the heads and accessories, maybe the power pack can be prepared(?) ...... All heads worked, but I only had 2 sets of flash tubes and modeling lights... But the cover came off one head and at least one set of bulbs broke you can get adapters for the modifiers to fit other systems ..... FREE if taken right away, otherwise it will go to recycling