protecting car cushions from carseats

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Does anyone use Carseat savers (http://www.canabeebaby.com/product_i...d7f25d948e)?My base for the Britax chaperone left an indent in my parent's camry. Had it installed there for 10 months. After being off for a few weeks, looks like the foam has bounced back but the fabric still shows the spots where the base was pressed into it. OOur Mazda5 has no problem since I can recline the seat to relieve the pressure of the seat when we aren't using it.Just bought them a new convertible carseat when we got ours and don't want the same thing to happen.Saw this Carseat savers (http://www.canabeebaby.com/product_i...c717d7f25d948e) online and wanted to get feedback from anyone who might have one. Or ideas from someone who DIYed their own seat protector.