What do you think of it? Especially its disease-resistance?

Have not Grown 602. Have grown BHN 444 and BHN 1021. Thier main claim to fame is resistance to Tomato Spotted Wilt Virus. They do grow well when TSWV is a problem. They are an attractive fresh market tomato but are not the most flavorful even compared other TSWV varies. BHN 444 is hard enough to play catch with. BHN 1021 is a bit better but still trails Bella Rosa, Amelia, and Mountain Merit among the TSWV vaieties. I would expect BHN 602 to have characteristics between 444 and 1021. BHN 640 is advertised as a better tasting version of BHN 444.

Thanks, farmerdill. Sounds like it could be at least somewhat hard. I'll check out Bella Rosa, Amelia and Mountain Merit.