I use the one with the pail of water... works great, has the longer hose so i
don't have to listen to the shopvac so close to me. I generally set that up
outside and sand away. The hardest thing to get used to is the heavy open mesh,
if you use too much pressure on the final sanding, it shows the mesh marks.
Just like anything else, it takes a little time to find your comfort level. The
best thing about this system is that there is very little airbourne dust
settling and that makes my customers happy!