Haven't tried the loader, but if it works like their magazine's, then I'm in! I've been abusing 2 of their mags since October, and they have performed flawlessly.
I use ETS mags wherever I can. Absolutely love being able to easily see round count. 17/31 rounders work great by themselves, but can be problematic when using extensions.
The video makes this loader look cumbersome and overpriced. I'll stick with my hi-vis Uplula for now...
I'd get an uplula as well, I've been playing with an ets glock mag for the better part of this year. It's ok but had spring issues early and I won't spend a lot of money on their products. Neat though!