I own the legitimate version, which is the Eagle Racing R31-16FM. DO NOT GET THE DEVIL.
The TEH-R31 is their original clone, and a lot of stuff broke on in, but there was endless parts support from multiple reputable manufacturers.
The Devil, on the otherhand, is a TEH-R31 conversion which only shares the suspension components with a TEH/OTA-R31. All other parts you break must be purchased through EAgle Racing, which is located in Japan. Expect to pay 25% of your order on shipping.
Beyond this, the car is beyond impossible to set up. I had to have locals set it up for me, as my mind couldn't wrap around setting up a front motor CS car. The Sakura D3 is the same, also hard to set up.
Long story short: The legitimate chassis is a great product, but one of the greatest annoyances is the front motor limits the amount of bodies it can fit. The clone version shares the cons of above, but have fun paying for expensive replacements.
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Traxxas Rustler VXL (for sale) - Eagle Racing R31-16FM @ 2.18 CS - HPI Sprint 2 RWD
I offer custom vinyls/license plates for your R/C cars and custom body work. PM me for more info.