Is DataStore reliable?

GetAsync only has a 10 second cache. You can store your stats as values while the player is in-game and then save them with DataStore every 20 seconds or so.

The reason I said to use values is because if someone gains experience less than 10 seconds after they gained the other experience it will cache. Saving them with values AND THEN transferring them to the database obviously wouldn't cache.

In my opinion, yes it is.

There's more advantages to DataStoreService than data persistence.

With DataStore, you can access a players stats via admin. This could be useful for competitions and they're not online to receive their points award. (Just one of the thousands of uses of DataStore)

It is very reliable. It saves data even when a game shutdown/crashes