I thought this post would have gotten more activity. I've injected with apple juice, but honestly didn't notice it much. Maybe I didn't inject enough??? I saw on a barbecue show that these ladies injected theirs with apple juice and to the judges, it made a noticeable difference.
In the past, I've just rubbed my butt :-) and added the soflaquer finishing sauce at the end.
Also, I tried one of the vinegar based sauces (starnes) in the recipe section and everyone loves it on the sandwiches. It's really good stuff! I wonder if it'd be safe to inject with that???