My San Marzano tomatoes were very flavorful and turned out beautifully. I have used them to make everything from pizza sauces, bolognase and bruschetta to tomato bases for red curries. Everyone including my sister-in-law (she is a classically trained chef) said they were some of the best dishes they have ever had. Now I have eaten at some of the top restaurants in the country who overnight ship fresh tomatoes everyday from Italy. I completely agree with your friend that Italians have the best tomatoes! Their mineral rich soil definitely is borderline magical for growing delicious produce. However, the San Marzano's from my garden so far have been the best comparable tomatoes that I have tried and everyone who has tasted them has agreed. I will never claim that they are as good as actual Italian grown tomatoes, but second best is alright with me

I will also add that I live right next to a river and we have some of the best quality loamy soil in the US which may be why my San Marzano's are flavorful instead of being bland. If you already have the seeds I would definitely recommend growing a plant or two next year. If they don't turn out then you will know that they don't work with your soil and if they do you will have some amazing tomatoes.