I would know because I've been using the cordless Dyson for almost a year now, and it's one of my favorite things ever. I used to DREAD vacuuming. I hated how long it took, how you had to keep stopping to unplug and replug in the cord, and how mundane the whole experience was. Well, not anymore. I honestly never thought I'd be the kind of person to get excited about getting a vacuum, but this baby is brilliant. I can vacuum my whole apartment in about 5 minutes (it's pretty small) without ever really stopping. Plus, it has different attachments that help me reach those hard-to-reach places (*cough, cough* under my couch) that haven't seen a vacuum in years.
Promising review: "Best vacuum ever. Period. My house has never been cleaner. It just keeps finding buckets of hair and dirt everywhere! I don't remember to leave good reviews, but I had to for this purchase. Totally satisfied. You will be too. It can reach everything. Under, over, on the fans, the blinds, the carpet, the tile, the A/C Vents, the couch, EVERYTHING! We have three Australian Shepherds, and it picks up all the hair and dirt. I couldn't be happier with this vacuum." —Corey
Get it from Amazon for $299.