The BW King 5x7 tanks are very workable daylight tanks. I bought two and they are pretty trouble free and reliable. They're like an upsized 120 metal reel and tank. The only trick that is to be sure that each 5x7 sheet is loaded far enough into its individual groove that the trailing 5" edge catches and is behind the cross-piece on its respective groove so that the film doesn't slip out when agitating. I practiced a bit with some junk 5x7 sheets. Once behind the cross-piece the natural tension of the sheet holds it in place.