Very happy with the product. Heard that it was difficult to assemble, but did not find that to be the case. Easy directions. All pieces accounted for. I put this together myself (queen-size) so it took a bit longer than the 45 mins they estimate. About an hour fifteen. Read a review that the center was not firm but to the contrary, it is well designed and the materials (although not of the absolute highest quality), are more than adequate to do the job.
I've slept on it for one week now and no problems. No sqeeking or creaking!
I highly recommend this. It's an excellent product for the price.    
PS - Suggestion to the manufacturer: The enclosed allen wrenches could stand to be milled better. Can be a bit sticky inserting into the bolts.