Most of the solunar calendars are bred from the same method of execution, but may be tweaked this or that way.
There is definitely something to them though. Like Reason said, I think the most important thing is to take in all factors, i.e. weather, phase of the rut (if deer hunting), lunar tables, etc and compile them.
Bottom line is even if the solunar tables say the day is going to be a good one, if it is an 80 degree day in late November I'm not going to be out there all day long!