Anyone know about latex mattresses or latex mattress toppers?

I’m interested in getting a new mattress and a bit intrigued by some of the claims about latex mattresses, specifically that they resist dust, compare favorably to the memory-foam stuff, and are supposed to last about forever. However, they are rather expensive, so I also wonder whether the same thing can be accomplished with a normal mattress and a latex topper.

Do any dopers have experience with either the mattresses or the toppers who can share their opinions? Are any manufacturers recommended above others?

Some info on latex products:

http://www.aafp.org/afp/980101ap/reddy.html Be aware of this. A neighbor has a sign in his window about latex allergies. His wife has it and it is very difficult to avoid.

I’ve got a latex mattress; I really enjoy it.