Sweet Apple Massacre didn't bother me. Not because I've got a stomach of steel (believe me, I do NOT), but because it was literally just violence and gore for the sake of being there (plus my boyfriend and I were on Skype together at the time and he was asleep, and his breathing soothed me). It wasn't written well and it was just too over the top. I tried reading Rainbow Factory, but the main gory part I didn't really visualize well, so I was just confused. Plus it was long and I didn't feel like really reading the whole thing. But those are all the grimdarks I've read.