We have a 13 lb Mantus on our 22, and it has been great anchor. We have used it all over the Southeast from Houston, were we live, over to Georgia and down through the Florida Keys. Knock on wood, it has never drug, even through the big thunderstorms that pop up in the summer. It has always set first try, and it really does set like in the videos when you play around with it in the shallows. I do always try my best to anchor in good substrate with good protection though.
I also have their dinghy anchor which I use on our kayaks, and it works well too.
I originally went with these guys because they are a local company. I spoke with the owner at several boat shows and he seems to be a great guy.