The dust bug is useful for keeping the record clean as it plays, but is no substitute for a handy record duster. I would use both, and clean each after every side.
Btw, the best way to clean these implements is with a sticky roller. Instead of flicking the dust into the air and back onto the record, the sticky roller picks up the dust and holds it till the roller itself is cleaned.http://www.ebay.co.uk/itm/WASHABLE-STIC ... 5d3a49ad2d
Be aware that these are not an inexpensive alternative to the Nagaoka Rolling 152 record cleaner. The sticky compound in the lint roller is too grippy and will shed some of the compound in the grooves. I know because I've tried it. They are otoh, useful for maintaining the tack of the Nag roller between washes.