What can I expect from Hybrid seeds ?

[BillGill]

Hello. Last year I had a BHN 602 - Bonnie Hybrid tomato in a large container pot located in a sunny spot on my porch. To my surprise I discovered two or more seedlings growing there this season. My question is what can be expected from these plants. I seem to recall that hybrids are not successfully raised from the next generation. Any information is appreciated. Thanks.