IMO, the RR kills the Yeti dollar for dollar...it's a noticeable difference in reliability out of the gate.

The kit Yeti still needs motor, ESC, servo, RX, TX, light bar etc and still isn't as tough or as fast. The Yeti cannot run 4.5S to be as fast and hope to survive long with a 3150kv motor to get a similar speed.

Now, whilst the RR 'can' tolerate 3S usage out of the box and do 40mph, it's only if you don't run it on grippy surfaces. The RR is plenty fast on 2S so you may have no use for 3S and the crazy fast speeds it produces...I don't anyway as I know it's just asking for problems and I LOVE the robustness of the setup on 2S.

If you have no plans to spend $1500 on a truck with billet axle housings and custom everything (either because you want it to survive lots of abuse or you like spending up on a crazy truck), the RR is IMHO, the clear pick.

You can spend a bit on the RR and make is a fantastic bouncer and in the future is may be very tolerant to high speed 3S bashing (as the aftermarket are getting on board and it only has a couple of obvious issues that the hardcore guys have found wanting...unlike the Yeti that is well documented).