HST is one of the best hollow point designs ever. It is my preferred defensive ammo. I would get some in .380 if I didn't already have quite a bit of Gold Dot and Critical Defense.
The 12" threshold was chosen because 12 inches in ballistic gelatin corresponds to real world performance that is likely to reach vitals under a variety of non-optimal conditions (heavily clothed assailant, oblique shot that goes through an arm first, etc). For defensive use by private citizens though, I think 10" is not bad, especially in that caliber.