I was shocked at all the negative reviews, having just given daughter one as Christmas present and being pretty satisfied! Then I started reading them and realized that they all reflect Customer Service, not the actual product.
I bought the Rock Princess one at Walmart - so no CS issues:) My 9 1/2 year old daughter really wanted two for her bunk beds. We couldn't find second one locally (and only a few days before Christmas) another style/design, so bought the ZippySack for the 2nd one (more later, but it truly sucked and has been returned).
Bottom line? AWESOME.
The fitted sheet is nice and tight. The comforter is OK - it's not too thin, but not nice and thick/plush/comfy. The cotton is cotton - so not super soft. It works as advertised: stays on bed and kids just flip the cover up and zip open or closed. She LOVES it. The comforter does reverse by unzipping each side, flipping the comforter over. The pillow case you just flip to the other side.
A couple minor points I would recommend to improve slightly:
1. The zippers slide nice and easy, almost too easily. Normal shifting during the night works them down. Could see this being not bad for little fingers zipping and unzipping; but for my daughter it's too slick.
2. The bottom is open. This is no surprise as you see this in the video. However, zipping all around like a true sleeping bag might be better; otherwise, the point of a comforter (warmth) is defeated with the bottom open. This may not be possible due to the unzip/flip ability to change the look.
3. As mentioned the comforter could be thicker in general; or even plush! Or the option to choose thicker/plush (which I'd certainly pay the difference for).
Overall - the ACTUAL PRODUCT IS GREAT.
There are too many retailers that sell this to bother with the customer service - so just don't buy from the company itself.
Now - brief comment about the ZippySack. DON'T BOTHER. It's not really clear on their site, but you need to have a fitted sheet and pillow case. This is ONLY a thin, plush fitted bumper with a single side/bottom zippered top. It's a single plush layer so not very comforting/warm (I'll say it - 'cheap'). I bought the pink cat, which is clearly shown to come up high enough to cover a pillow. This is NOT the case. The top of the ears barely came to about 3/4 up the bed and my daughter had to scoot down just to be fully covered. It also fits tight (since it's attached directly to the fitted side bumper) so not a lot of room for turning over, etc. She (and I both) hated it and it got it returned. Now searching for another Zipit Bedding to replace it.
Bottom Line: Yes, I would recommend this to a friend