Personally, I save my MRP to purchase from the Rewards Store. I generally will choose either the Chinese Gold Panda 1/20 ounce or the Silver 76 Pack which is 1 ounce of Silver plus 75 TCredits.
From time to time I may also use MRP to purchase additional TCredits for use in many ways. But with the Gold and Silver, I can invest for the future and sell them when the price for them goes higher. All in all, I find that to be the best investment and use of my MRP.
