I just figured I should give another update here.
I have been using bb's in most of our tires now and in a few other cars. The rest of my tires will get them very shortly. They work, and they work very well. I have not been using any wheel weights with the bb's.
Everyone who rides in our buick comments on how well it rides. I tell them to listen the next time we stop and they hear the bb's hit the rim. They always get a funny look on their face and ask what the noise is.
I tell them it is my wheel balancers telling me they are still working.
I used a lot of used tires last year, and used tires are often times not in great shape balance wise.
We had one tire that was out of round and made the car hop badly. I installed bb's just to see if they would help before I replaced the tire. THEY DID!! The ride smoothed out around 35 mph and rode like glass, but it was still horrible at low speeds, so the tire was replaced anyway, as planned.
I want to say one thing just to be clear. If you have a worn tie rod or ball joint, you will feel it sooner than you would with lead weights. This is because the tire will have a hard time balancing due to the slack. Simply replace the worn component and you will be back in business. Tires with massive amounts of lateral imbalance will need a lead weight, but most tires take the beads just fine.