I just spent my first night on this mattress topper and it is the first time in years that I slept the night through. The only other nights I slept this well was in 4 star hotels. I ordered the Cal King and it was the perfect length for my Queen size mattress. I trimmed off the extra on the sides with an electric carving knife with no problem. The mattress topper unrolled in minutes and we let it air out for 24 hours. There was no bad smell or any other problems, although I do recommend that you make sure you have deep enough sheets to accommodate the extra 4 inches. I will try to update this in a month to make sure it is still comfortable.