I got one several years ago, and wasn't crazy about it, since the plastic piece that attaches the clamp to the magnet is very close to the clamp edges, and tends to accumulate any excess glue that runs off the quill. It was made from some kind of plastic material that adheres to the glue, making it hard to clean the glue off. Maybe they've changed that.
What I do like about it is the ability to quickly make six-fetched arrows, which I use for flu-flus, so I use it almost exclusively for that purpose now.