I am one of those idiots that has to buy/try every new gizmo he sees. I've bought every kind of speedloader I've ever seen, but now I'm almost 100% brand loyal. We used Safariland II loaders for our 66's and 681's when I worked in LE, and they were wonderful. They still are, and they're what I now carry on duty, four of them.
I have a bunch of the H&K speedloaders, and for whatever reason I'm not very good at working them properly, I either spew rounds everywhere but the gun, or I can't get it to work in anything under 30 seconds. The only time I use the H&K's is when I can't find a Safariland II in the caliber I'm carrying.
The Safariland II's are nigh on indestructible, we used to step on them and kick them all over the range floor when we were practicing reloads and I never saw one break.