According to a report by Semico Research, SoI as a substrate can reduce the cost of ownership of some silicon by up to 40 per cent.
This is leading several firms to adopt SoI:
... the number of firms adopting the technology is steadily growing. AMD and IBM have already made the switch for specific processors, while Freescale, Renesas and Atmel are also SoI adoptors.
As production capacity of raw wafers slowly increases, (Soitec is constructing a 300mm fab in Singapore) then expect more and more companies to start switching to SoI for cost reasons - not just performance.