Pros : The handles on both the piston and the casing make it far easier to use. I especially like the super strong magnet.
Cons : The biggest problem is that both the piston and the interior of the casing are painted. It scrapes off into the glass and isn't removed with the magnet. While this isn't as much of a problem with larger frit sizes where it will be sifted out, if you work with the powdered form, it tends to muddy/mute the colors.
Other Thoughts : Here's a tip for using the magnet: Never drag it directly through the glass--you'll be forever trying to get the filings cleaned off. Instead, drop it into the corner of an envelope, e.g., and drag that through. Then just hold it over your disposal container, pull out the magnet and the filings fall right off. And the white background of the envelope makes it easy to see when you've finally gotten them all.