We got to sleep on the bed with the memory foam topper this past weekend. It was night and day from the original mattress. It does make the bed taller but all of the covering/sheets/etc still fit fine. It does occlude the storage on the back side of the mattress, but pressing on the mattress still allows access. With the slide shut, there is very minor pressure on the opposite wall from the extended length.
I would recommend highly.
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