Sink your toes into the newest carpet style, called ultrasoft or super-plush carpet, and you might decide that spending twice what you would on an ordinary carpet is worth the treat to your feet. But that comfort might lead to an additional, hidden cost: You might need to replace your vacuum.

Many vacuums that work perfectly well on regular carpets stick to this new kind like a big suction cup. That’s because the plush carpet is so dense that air can’t circulate back into the vacuum’s intake, making the appliance almost impossible to move. Because ultrasoft carpets have become more popular—sales have grown to more than 10 percent of the market in the past five years—carpet makers have begun testing and recommending vacuums for them. (Examples of plush carpet include Caress by Shaw and Karastan by Mohawk.) Vacuum manufacturers are making models specifically for ultrasoft carpets, too.

We bought several square yards of both carpet styles plus two new Kenmore vacuums designed for them, the Kenmore Elite Crossover Ultra 10335 upright, $300, and the Kenmore Elite 700 Series 81714 canister, $400. They both cleaned well and moved easily on the ultrasoft carpet, though we found that they were easier to maneuver on standard (medium-pile) carpet.

We also ran our push/pull tests on some vacuums recommended by ultrasoft carpet makers. We found three that moved fairly easily: the Maytag M500, $300, the Fuller Brush Mighty Maid FBMM-PWCF, $400, and the Oreck Magnesium, $500. But we don’t recommend them because they aren’t top performers overall.

If you have a new plush carpet and you aren’t ready to buy a new vacuum, we can suggest a workaround if your vacuum is sticking. Raise the powerhead on models that come with manual height adjustment; the control is usually on top of the powerhead. If your appliance automatically adjusts height and has suction control, you might try reducing the suction instead. Both of those steps may also reduce cleaning power, however, so you might need to spend more time going over the same spot of plush carpet to thoroughly remove dirt.

For more vacuum choices, including the models that are the best at cleaning carpet, bare floors, and pet hair check our full vacuum Ratings and recommendations.

Editor's Note: This article also appeared in the March 2016 issue of Consumer Reports magazine.