Dust Collection?

Looking to get a dust collector for my sanding areas - one indoors and one outdoors. Any comment on one of these:

http://da.harborfreight.com/cpisearch/web/search.do?keyword=dust+collector&Submit=Go

Anyone have some experience with them?? Thanks

check out lowes, saw one for #199.00, dual collection bags and it was at least a 1hp motor.

heard I should get at least a 500 CFM and also what size is a sanding particle? 5 microns? 1 micron?