I'd say just about anything is better than the stock sights, but it doesn't have to be Ameriglo. There are a ton of great sights out there, but you'll also have to consider install. Though you can do it yourself, that comes with a host of potential cosmetic issues. Otherwise you pay. And on top of $100+ sights, you can really get up there.
As an example, a new set of Dawson Fibre Optic sights are like $140 to your door. A Smith will probably charge you $100. That's a pricy tune to play.
So, if you're not super specific about your sight setup, yes, they're worth it. Ha