Instruct: Classify a given Amazon review as either positive or negative.
Query: Sto-Fen Omni-Bounce

I received this unit for Christmas along with a Sunpak 383 flash. So far I have not been able to use it because the black gizmo that holds the filter won't slide onto the flash unit. The plastic is too thick to fit into the groove in the flash. Hopefully, my husband will be able to cure this problem in the shop--however, a unit that was supposed to fit the flash should fit it when received.