I worked part time at a GoodYear dealership about ten years ago. We used the Equal brand balancing compound and never had any complaints. I seem to remember something about not using it in the steer tires on semis but it's been so long I don't remember.
I used Equal in both my 77 Bronco with 16/38.5-15 Super Swampers and 78 GMC with 31's with good results. I put it in when I mounted the tires so I can't say it made the ride any better. I just never had any issues with it in my tires.