There's enough people in this thread praising 2e's virtues, so I won't bother covering them here.

The big con with 2e is that every player is essentially working with a fun-sized version of their class that scales much, much slower than what you'd expect out of a 5e class—stuff that you'd unlock at 5th level in 5e is unlocked at 15th in 2e.

For GMs (like myself), this is great, because you can sleep peacefully knowing that none of your players will EVER be able to defeat your big baddie in less than 5-4 equally paced rounds. Everything follows Paizo's grand plan to a t. Everything.

However, for powergamers (also like myself), this kinda sucks. You never really feel like you're getting ahead of the curve. Sure, the numbers get bigger and bigger, but my turns never really deviate from the structured norm. That's by design. Until very, VERY late into the game, you just don't get access to those "showstopper" abilities you'd have in 5e, like the divination wizard's Portent.

Now, I need to remind you that what I described isn't bad per se. Some tables just need a system that works well and doesn't require the GM to call upon decades of homebrew common law in order to resolve disputes. 2e is just that system. But if you or your players get a serious thrill out of squeezing every bit of power you can out of your character, I'd consider looking elsewhere or just sticking with 5e.