If you can get a money back guarantee, take it ! Personally I'd be surprised if you could get one. When the season opens up in May, the walleye are just done spawning and they are in shallow water. The water is probably low 50s.
Later on as the temp rises in L Erie, they usually go to deeper water because they like it cooler.

But who knows ? Someone said a while back "that's why they call it fishing, not catching". Truer words were never spoken.

Walleye like to run in schools, but the bigger ones are mavericks and they travel alone.