Transference felt from mattresses?

Hi I live in South Africa and have very recently had 3 bedrooms revamped and had an Interior Company supply imported box type BASES, fitted with "Slats" and have used the top of the range Seally pocket coil mattresses.
However from the first time that it was used in January 2012, we found that if one person moved and rolled over, the other person felt this.
I must say that the amount of movement was exaggerated and extreme.
When just moving slightly it almost felt like you were on a "water bed".
This is very irritating for the other person on the bed.
I was told that for the "pocket coil " mattresses you need a solid board as a base in the case of a box bed, or a proper base made by the manufacturer.
the reason for going for a "designer" type box bed, was that my Wife feels that the bed looks better when made up, and not base frill to worry about.
Please advise as to what your best recommendation would be in this case.
Many Thanks Imtiaz Joosab South Africa .