Craftsman vacs are notorious for that. The DeWalt I described is great. However, I dump the dust and blow out the filter behind my house with a leaf blower after every testing job. If you prefer electric, I also have a Rigid I bought off the Home Depot web site. Still use it as a back up on big jobs if needed. You won't find this particular model in the stores. It looks like a slightly oversize tool box. It runs about $100. Don't get the similar sized one with wheels. The tool box design is tons easier to carry around a job site. Plus, it has a storage compartment inside for the hose and attachments. You'll need to use the replacable hepa filters though to be dust-free. Those can be found at the stores and run about $11 for 2. They last a good while though. Only thing about the filters is that you have to position them just right inside the vac or the interior housing will tear them. Found out I did that a couple of times on jobs and had to seal the tears up with duct tape. Good luck!
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