Great idea - but dog is uneasy
I received this product and was happy with the design and quality. It does take two people to put together, but it was pretty easy and quick. However, my 4 yr. old Lab/Boxer mix is very uneasy and has ignored it. When I first introduced it to her, she tentatively got up on it, but it was as if she were trying to walk on a water bed. I encouraged her, gave her treats, even took her old bed out. She chose the floor. About the third time she attempted to get on it, the rubber padded feet squeaked a bit on our hard-wood floor, and that was it. She is normally not that afraid of things, and when she was smaller, her favorite snoozing spot was an ottoman, so I thought she would love this. Now, because I don't want to pay shipping to send it back, I'll give it away or sell it in a garage sale.

Slightly unstable
The medium size is more than large enough for my 35 lb Australian Shepherd. The fabric is tough & breathes freely. It's sufficiently taut & my dogs seem quite happy with it.

As mentioned in another comment, the frame does tend to twist, but only if all 4 legs are not resting on the ground. I also didn't like that the instability of the frame allowed the bed to sway when my dogs got on it. Placing it flush against another vertical surface (the wall, a tree trunk) helped.

Works great
Didn't think our dog would like it, but gave it a shot. She was scared to get on it the first couple of days, but now she's always on it. However, it does sag a bit (She's ~20lbs).

What is all the fuss? Less than 5 minutes, done, dogs on beds, everyone happy!
We were not sure which size bed to get, so we bought two medium, and two large to start with.
We have two lab mix puppies, one is 55# (22" height), the other is 40# (19" height). I wish someone had added heights of their dogs in their reviews, it would have been such a huge help! The medium is more than adequate for both dogs. They also have wicked nails, but are the length they are supposed to be, and they did not poke into the cover.
The bed was easy to put together with just one person. Not sure why other people have had problems, but they were done in a snap, and the dogs took to them immediately.
We kept the two large instead of sending them back and are using them in the basement/outdoors. I have ordered additional beds for inside to put their beds on, to get them off the floor. Beds that have fleece or a suede like finish on the bottom, these will not slide on the cover, other material will require a non-slip grip material placed between the cot cover and the bed to keep it from sliding.
Just in case, additional bed covers were purchased at the same time.

We are thrilled with these beds, and the dogs seem very happy also! I cannot wait for the others to arrive!

My 55# was diagnosed with severe hip dysplasia at 5 months of age, so her bedding is very important, and we use the same for the younger dog as well. They are 15 mo, and 9 mo. old right now. Both were severely abused dogs that we adopted at 5mo and 6 mo. old.

This is one of our best investments!

Perfect for outside!
I have two Italian Greyhounds who love to lounge in the sun. I got terribly tired of moving their "inside" beds in and out, often forgetting them and having them wind up getting rained on, etc. Tired of washing their fabric beds for the 100th time, I purchased this bed as a permanent outside solution, and I couldn't be more pleased. Both dogs can share this medium sized bed (they are <20 lbs. each) with room to stretch out. In the month we've had it, I haven't had to do anything to it. The mesh fabric stays clean and it dries in a flash if it gets wet. The frame and fabric appear plenty sturdy for my two dogs, who together weigh just under 40 lbs. Assembly is very easy--my three year old even helped.