My experience pretty much mirrors Fingers284's. I shoot plated brass all the time, too. Some for so long that, the nickle plating is pretty much worn right off some of them. Never any concerns, so far.
I fully agree on previous comments though...regarding brass flaking, case splits, etc. I either discard them. Or...in the case of .38 Special or .357 mag revolver brass...if only split at the case mouth, cut them down into .38 Long/Short cases.
Since your question revolved around using plated cases with bp : When shooting bp rounds, I did observe that nickle plated brass tended to stain less (if at all)than regular brass, and cleaned up a bit easier. Otherwise, I did not see any advantage/disadvantage of one, versus the other when it came to reloading. This, with both pistol-caliber and .45-70 brass.
Co-incidentally, a similar question recently popped up on the SASS Wire forum. The general consensus was that nickle plated brass worked well with bp. In this case APP...a bp substitute. But, clean up with most of the subs is similar, anyway.. If you haven't already seen that Sass Wire thread, it may be worth the time to check it out.
Al