Best time to have bought was back in the mid 90s when Michael Dell wrote of Apple as good as dead. 
It's up to you, I think the people who could've made substantial amounts of money on Apple already have, the returns at this point is slim compared to the risk... they could absolutely surprise us with tremendous growth but they will have modest growth imo.
It's up to you, I think the people who could've made substantial amounts of money on Apple already have, the returns at this point is slim compared to the risk... they could absolutely surprise us with tremendous growth but they will have modest growth imo.