Do you think the mattress foam mattress memory are comparable to the full?

Just curious, if someone has tried something like 4-inch pad of foam on purchasing memory foam mattress together. Would ask me if it offers a comparable experience, because I really can not afford a set of memory foam bed. Serta Rejuvenator 4-inch Mattress Topper http://www.overstock.com/Home-Garden/Serta-Rejuvenator-4 -inch-Mattress-Topper/3298223/product.html? cid = 123,620 & fp = F & ci_src & ci_sku = 14,110,944 = 11,397,732

A 4 inch topper is suitable for most people, but better several inches if you try before you buy. If you buy a topper, make sure your bed is firm enough to support the height. This article has some tips on the purchase of a mattress topper memory foam that can help.

Memory Foam Mattress - How To Compare Memory Foam Beds