I've said this on some other threads, but right now I'm using Speer Gold Dots in my house gun and carry gun. In the gun I'm going to be using for armed security work, I'll still be using Speer Gold Dots, but loaded by DoubleTap Ammo. I really like the company as their products seem to deliver higher performance at a great price.
The trouble with DoubleTap is two fold. They diffinetly load the ammo to develop higher velocity than Speer does for theorically better performance. They mention that they've tested the performance and give some data (depending on the load), but don't enable you to look at their research. It's up to the user to test the ammo for it's capabilities, which I don't have the ability to do since I don't have a range that would let me test terminal performance.
The other issue is that they've changed the tittles of the loadings. Instead of mentioning that it's loaded with a Gold Dot, they describe it as "bonded defense." This change is not a huge deal, but it concerns me when they stop using the Gold Dot for a generic tittle when it's the same loading.
I'm starting to consider other rounds like Hornady TAP, Winchester PDX1, and Glaser Pow'RBall.