I have cherry barbs in my 80 gallon (it's well planted & has lots of rock caves). I've never had an issue out of them. They make a lovely school and never nip my other fishes
Keep in mind temperment varies from fish to fish though, but from my own experience, I think they make good tankmates! (I have lemon tetras, glo fish, ghost/glass catfish, angelfish, pleco, and a blue powder dwarf gourami with mine)
I think that people run into issues when there is not enough room in the tank for everyone and they've overstocked....i would think that would provoke issues over territory. When you add your new barbs to your tank...I would suggest rearranging your plants/caves so that everyone has to establish new territory...I'd also turn the light off in the tank for the first introduction. Good luck!