I have to admit to a reflex, of sorts, about the "specialty" defense ammo. If it costs 6x the price, I'm not using it, as there's no way to afford enough to practice with And, there's no way I'm just trusting that the $6 apeice wonder ammo is going to shoot where the practice ammo does.
I bought some Silvertip .32acp, back in the day, mostly to see if it were more reliable than the discount FMJ I was getting. It was, a little. But, my standard was the one posted above: "Does it go bang?" Which why I have like 5 of the STs left in the pistol carry bag.