Randy... I can't provide you a comparative rating but I've a few thoughts.
As you say, these things generate a mountain of sawdust. The one you have in your voc shop is surely connected to a dust collector and I wouldn't consider installing one in my shop without one. The 22/44 has a singe 4" connection, none too large for that big of a sander (the Griz has 2 4" ports), so I'd look for a good strong DC, something like a Jet DC1100 or bigger, if you don't already have one. This is not a candidate for a shop-vac conversion as it requires far more air volume than a shop vac can accomplish.
Someone with one should come along soon who can give you a review.
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