Overall I like this a lot. Pros: it looks nice, it has drawers for storage, and it easily pulls out to fit a second twin mattress and create a king bed. We are using this for a guest bed.

Cons: The drawers were pretty hard to install. They didn't fit well, and we had to really finagle with it to make them sit correctly. Also, the second mattress does NOT store under the bed, on the trundle area. To store it on the bed, you'd have to have both twin mattresses stacked on top of each other on the main bed part. We ordered 6 in mattresses, and this would have been too tall. With a 4 inch it would fit better, but they would be pretty thin mattresses. 

We elected to order a mattress protection bag, and store the mattress in our garage. Just be aware that the mattress cannot be stored in the bottom trundle area, like you would be able to with other trundle beds.