Current orbwalkers aren't great. EXT has some pretty different limitations. Some of them could be fixed if fere got on to dedicate some time to fine tune his side of things, which hasn't happened for a while. Orbwalker is decent, just don't expect to play in diamond + with relying on orbwalker, would most likely need to farm yourself. It at least shows you when you can kill a minion, so you can use the drawings and last hit yourself. For melee champs, orbwalker works good because it doesn't cancel at all, but for people like ADC's, it's sort of unpredictable on a per person basis. The benefit to external over internal though is the ban rate, which is non existent on external