"Unique does okay in everything and great in nothing."
Actually it does do great in several calibers/loads. I use it in my USPSA match loads. And it's a well documented great load in .44 Spl,, the "Skeeter" load as many call it.
It's a very versatile powder and is used a lot by many. But as all of us who reload,, each & every gun is a machine unto itself. Experiment with loads to find the best for each gun. This includes different powders.
And as mentioned,, in some calibers, use caution & NOT double charge a case. Using a loading block, fill a case with the proper amount, put the case in the loading block. Once you have the quantity you desire,, a good light, and a physical exam of each case from above will allow you to make sure you have the same level of powder in each case.