I have a nice pheno of White Widow, and I have 3 phenos of Grand Doggy Purps and I love all 3, all from bag seed.
I had herm issues the first 6 months of growing on all my plants, but I think it was more attributable to my growing skills and my setup more so than the bag seed genetics. They were throwing ball sacks in the lower areas that weren't getting much light penetration. I've rarely ever found a single seed though, let alone a bunch of them, in fact I'd like to find a few but haven't. After a lighting upgrade, some refinements on feeding them, better lollypopping and just getting better at growing they stopped throwing the sterile ball sacks.
Almost every forum post I read about herms said to cull them, but they were all I had so I let them go ball sacks and all, and they've been awesome. Now it's rare to see a single ball sack. In fact I'm interested in forcing them to throw some nanners to get some pollen to produce some seeds. I'd love to get a good cross of the White Widow and the Grandoggies that produces Grandoggy type smoke but with bigger buds. The Grandoggy Purps are always out of stock whenever I check so I couldn't order them if I wanted to and it's my favorite weed to smoke.
I'd say if your seeds came from good smoke there's a good chance they'll produce something nice and I think a lot of times the seeds you're buying have about the same amount of tendency to hermie on you as your bag seeds do, especially the feminized seeds. There are a lot of people who have had hermies with seeds they've purchased from seed banks, these boards are full of them.
I wish I had more bag seeds.