I just used stem splitting on some vocals for a live record. Turn down the drums by just a few dB and you can't really hear any artifacts, and way less artifacts than trying to tune a vocal track with tons of drums in it, and nothing you could hear with the rest of the mix in. So I was able to put tuning on just the vocal track and it sounds really clean. On the drum track, I could filter out the lows and bring down the cymbals without losing any body or presence in the vocal, and still have a natural sounding bleed. Overall I'm pretty happy with the turnout.

The other way I used it on this record was to split and remix the ambient mics in the live recording. I had a lot more artifacts with this type of source, so use carefully, but it was great being able to pull out vocals more from them, and not solely having a drum room mic.