I got my car RSed in Feb this year. This was my second experience, was satisfied with my old black se saloon, so got RSed my GLi 2012 as well. They claim it to last for 3 years, provided u always use wet cloth for cleaning and shampoo wash once in every 15 days, but that is hard to maintain, so it lasts for 2 years. On my GLi there is still no need to polish and it is 10th month after RS.
People here on PW have some bad experience of RS due to application by untrained staff in lahore / isb during their initial days. But here in karachi they have got proper trained staff.
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