We have a 36 x 36 shower in our master bath that has a fiberglass base and tile walls. The tile is leaking and we would like to replace the walls. We had a "bath fitter" type company come give us an estimate for their acrylic wall insert - $4000. Our home improvement guy (that we really trust) can put in cultured marble for us for around $2000. What are the advantages of an acrylic insert vs. cultured marble. Seems like acrylic will last longer but is it worth that much more? The house is 12 years old (not very well built) and we plan to stay here at least another 5 years or so. Thanks for any input anyone has!