IMO they are worth the dough. The yellow top and blue top are the same with exception of the terminals. The blue top has both the traditional stud type and also the wing nut connections. There is a marine starting and marine deep cycle. The starting is a light grey case, the deep cycle is the dark grey case. Deep cycles will also start you boat without problems. If your gonna be running stereo with decent power get the deep cycle, otherwise the starting battery will do you fine wink