ABSOLUTELY!! Worth every penny. It will save you so much headaches and save you bully a lot of pain and discomfort. We went a year, my boy was always vomiting and our vet thought it was tummy issues so we were feeding chicken and race (bland diet).. turned out after we did the alleegy test he is highly allergic to rice. Once we got that out of his diet... the vomiting stopped.
You will find many, many members with similar stories.