I have two of them. The 4.75-inch one I've shot quite a bit, and I really like it. It's a hard gun to put down once in hand, and I like the four-click hammer.
The 3.5-inch "birdshead" one I recently got hasn't been shot that much and, when it was, it was with the first-ever (in tens of thousands of rounds) ammo I had misfires in. Because the gun was new and I had neither any other ammo or .22LR guns with me, I could not say if the issue was with the gun or the ammo (which was Remington GBs, the first rounds of that stuff I've ever fired.) Otherwise, it shot well, but was a little stiffer and "grittier" than the older one.
The HRR revolver has a manual safety that, when on, blocks the hammer from reaching the pin. This would make the gun safe to carry with six in it. It also makes the gun safe to dry-fire.
I do also own a Ruger NM-SS that I bought used maybe a year or so ago, but I've never shot it (mostly because I keep forgetting I own it!)