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The risk is poor shifting and vibration from the transmission when you use anything but the OE fluid. Spec for your car on a drain and refill is about 3 quarts of fluid, with almost 8 quarts required for a complete change-out. With dealership price of the fluid running about $12/quart, even a drain/refill is $36 worth of fluid.
Note: I already had approved the 4-wheel brake service for $150. Would have thought that flushing out the brake fluid would have been a part of that. We took our 2007 Prius in for its 30K service yesterday and the dealer called to say we should have the transmission fluid flushed to the tune of $230!!!