Late reply. I use the Butler Creek and I like it. It's best with Butler Creek magazines, as it states, but it works with the Ruger BX 25 magazines too. You do need to develop a feel for the Ruger mags though, you can dent the brass if you're heavy handed with it.
My BC 25 round steel lips mags only work if loaded to 15 rounds but the BC 10 round mags run like champs.
The OEM Ruger rotary mags do not work with the BC loader at all.