The Cajun is what I use--I have 30+ in use (different serving tool for each different size/type/color of serving), and I have 20 or more spares for folks that can't find them.
They are super durable (I am still using the first one I bought, some 10,000+ strings ago), and the tension is very adjustable.
I do modify mine a tad. I get a longer bolt and add some fender washers for added weight. It works fine without them, but better with them (for me).
I've tried several others, and gave them away or trashed them.
Chad