I can't stand heavy bats, I like to be able to feel that when I hit a six, for example, the confidence that you are a strong person. Plus heavy bats can make your arms tired of lifting it over prolongued periods of time.
plus it can slow you down too and get your stump knocked out if your are late happened to my mate once lol he took our heavist bat and went into the nets he was doing good until a leg spinner knocked his stump out cuz he was too late lol