We bought this for a bed at our weekend trailer.  Beautiful king size bed......horrible mattress!  So we purchased this memory foam topper and it made such a difference.  We were a little Leary if it was going to smell, but it didn't at all.  

We got to our trailer on a Friday at 6pm......unpacked it on the bed, let it sit for about 3 hours, and put the sheets on.  Easy-peezy.  And truly has made a huge difference to our sleep and comfort. 

I highly recommend it!

Pros: Easy to unpack....no smell......SO comfortable....felt cool to sleep on (temp)
Cons: The only odd thing was the topper was a little bigger than the mattress, but I'm convinced since it's a trailer king, it's a little smaller?