I work in construction and we use Dewalt cordless powertools (specifically their 18v models). From what I've seen these are pretty much the standard of the industry. Some of our Dewalt cordless tools are from 1995 and are still in use today. If I need new batteries for them (I usually get 3-6 years out of a battery), Home Depot, Lowes, and various other stores sell them in a twin-pack for around $110 and have for years now.

I could never see going back to corded tools, even for home use. The good cordless stuff now works just as well and we no longer find ourselves tripping over cords, having to run ridiculously long extension cords, having to deal with cut, tangling, or fraying cords, or needing to run generators or vehicles constantly just to power simple electric handtools. They've made our job significantly less frustrating and a lot safer.