What we have here is an innovative sanding block designed for a narrow range of uses.  If you use a sanding block, this 3M is worth checking out.I've built RC airplanes for 3 decades.  If I'd found this 3M sander on an RC website 30 years ago, I would've bought it.  Balsa creates a ton of dust.  I do most of my building in the winter months which means standing outside in the weather freezing my tail feathers off.  No more.Having only one sanding method for a hobbyist or DIY'er is like a plumber trying to do his job with only one tool: a screwdriver.This 3M sander is not for everyone.  It is specific in purpose as are many tools.  My rating is based on using it for its designed purpose, not sanding down a garage door.The biggest drawback for one who does a good deal of sanding is excessive use of elbow grease.This is a light plastic hand sander that uses sandpaper with holes through which the dust is sucked up by your own vacuum.  And it's designed for mostly flat surfaces and gentle curves like wings and components of balsa airplanes.For someone who does one or two small sanding jobs a year in an enclosed environment, this might be exactly what you need.No one tool is suitable for everybody.Most all of my detailed sanding jobs on tables, bookcases and furniture are done with the B&D; Mouse and rolls of sanding cloth regardless of the size of the project.  However, neither method offers a dust port.So many times in my workshop I find myself having to combine the best features of several tools to best complete a project.I found a good use for the hose on the 3M sander.For years when using the B&D; Mouse, I've held the Mouse in one hand and the hose of a small 6-gallon, 3HP Shop-Vac in the other sucking up the dust as I go.  I've always felt that the hose on the Shop-Vac was too big and rigid to easily follow the movements of the Mouse. It was a bit awkward but highly effective..The convenient size and flexibility of the 3M Clean Sand Kit hose is perfect.  All I did was duct tape the 3M hose to the Shop-Vac hose.If you do a lot of sanding, there's better news.If you have a Bosch Random Orbital Sander, variable speed, 8-hole sander for big jobs, the 3M hose and funnel shaped connector work great.  In fact, most brands of orbital sanders have dust collection ports that can be adapted to work.There are rubber boot adapters on Bosch for the dust ports.  Some are oval on both ends to connect the sander port with an accessory filter.  The one I have is round on one end to fit a Shop-Vac hose.  Whatever model you have, duct tape will made it work.I secured both ends of the 3M hose with duct tape and gave it a whirl.  Granted, it's not 100% effective but close.  When running the sander at slow speeds, my workshop stays dust free.In case you're wondering, a 16-gallon Shop-Vac is entirely too powerful and the hose is too big.  The restricted air flow created by the small 3M hose creates too must stress on the motor and will likely shorten its life.Not many DIY'ers and hobbyists have those expensive dust collection systems like the professionals on TV.  We have to make do as best we can and do what works within our budgets.Whatever you sand, make it as smooth as glass.