I've had mine for about a year now and I use it most everyday. I do most of my work in the gym but it's nice to have around.
If you have a Bed, Bath & Beyond in your area, they sell it at the regular price of $29.99 but they always have 20% coupons in the Sunday paper or online. I kept waiting for it to go on sale somewhere, and it never did so I went to BB&B.
It's also great to do push-ups and sit-up/crunches as it can hold your feet/ankles down.
One draw-back. If you live in an old building or apartment, the door jams might be too thick for this device. Check it out before you buy.