Are high-efficiency washing machines worth it?

Yesterday the Washington Post had a good guide to buying high-efficiency washing machines ("Time to Say Bye to Washers of Old?"). These washers are usually front-loading and use less energy and water than older models -- and can save you $50-$100 a year in utilitybills.

Denise DiFulco points out a few negatives in her story: These machines can shake violently and often have issues with mold buildup.

I don't own a front-loader, but my friends have given them mixed reviews. The energy and water savings sound worthwhile, though. Do you have one? How do you like it?

p.s. -- learn more about Energy Star qualified clothes washers here, http://www.energystar.gov/index.cfm?c=clotheswash.pr_clothes_washers