I have one. Single-loading sucks, but since I use Wolf, I can drop 10 rounds in, move back and drop the other 10 in.
If I do it that way, it will load faster than just about anything. The problem with it comes on the occasion that a round tips before going into the mag causing the thing to jam up. It usually takes about a minute to clear the jam, get the remaining rounds situated correctly again, re-insert the mag, and load it. Mine has been doing this more and more recently and I'm to the point where I don't use it anymore.
I won a LULA in the Team member drawings last fall and I've been using it a hell of a lot since then. It's not faster, but it works all the time, and since it hasn't fuxored up on me yet, steady and slow has beat out the fast and problematic.
WIZZO