The Smartstrand Silk carpet, while being very stain resistant, is extremely soft, and will show every vacuum mark and footprint.  If this does not bother you , then go for it. 
Gulistan makes some very good carpets, and their new Stainmaster products in Luxurell fiber are outstanding.  It will show a little less footprints because the yarn is not as bright as the Silk fiber.

Good Luck,
Jim

I have Intelligent style in my Master bedroom, and we love it.  I installed over SmartCushion in order to take advantage of the extended warranty.  I would not use Gentle Essence as I think it is too soft, and difficult to vacuum.

Good Luck,
Jim

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Thank You,
Jim