Considering there are no software updates for it, I would not touch that phone. Like Chemicalsam said, get the SE. It’s going to be supported for way longer, isn’t going to potentially compromise your data, and will be a solid phone for a good few years. Using a phone that hasn’t gotten updates in years is quite frankly dangerous.

That being said, having switched from Android four years ago: enjoy! The hardware is great, it works together, and it’s just fun to use. There are some great threads here too about fun tricks (one of my favourite is that if you accidentally delete something, shake your phone and it will ask you if you want to undo what you just did).