I would be wary about using it since it does modify the game, so a ban is more likely than using ACT, but I don't view it as cheating. It doesn't give the user an unfair advantage, it gives the user the same advantage someone right next to the servers has. Mch is well known for being latency locked at high end content as you lose considerable dps with high ping, and with this tool that issue will disappear. Just to be clear, it doesn't give you a faster gcd or allow you to do something others can't.