Excellent! I have 2 UV440 Shark Navigator Liftaway DLX vacuums that you can only get from Home Depot. Shark says there's no replacement for their brush, that you have to buy the whole head for $90. Not true! This brush is perfect. Make sure you have some sort of safety parts to take the power head apart and it slides in easily and does a great job. The only difference is that there is no slot for cutting hair out of the brush, but what a difference. I've got my mud-killing shark back, thanks!