We tried it at a mattress store (Slumberland.) Personally if you are a normal to light weight person and are used to memory foam type beds you might do well with it. However if you are a slightly heavier than normal person...the one we tried at the store was way too soft. We are used to a memory foam topper but the bed in a box did not have enough firm support in the middle to be comfortable.
My best advice...find a furniture/mattress store that has one set up and go lay on it for a few minutes. I think that is the only way to really know if it is for you!
Good luck...shopping for mattresses is worse than finding a pair of shoes that feel good on bad feet!