Update w/ pics:
Here's the Milwaukee vacuum. The device itself was $120, but with battery and charger it added up to around $210:
It does pick up a lot of dirt, 22's and aluminum:
I found it best to dump the container onto a bench, then hand separate the debris from the brass that I wanted to save, and then sweeping the remaining debris into a trash can.
My recovery rate was around 94%, but more then made up for my losses with other range pick-ups. I picked up around 2lbs of stray brass in about 15 minutes without hurting my back. "Payback" should be around 1-year, going to the range once a week in terms of scrap brass prices.
Of course, as Engineer1911 says, the best back saver is one of these things:
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