"This set is a great build, but you have to get it perfect for everything to work right. That's why I rate it "very challenging." If anything is misaligned, some of the neat and very clever little thingamajigs LEGO has built into this car will not function right (I read a lot of negative reviews where they had that problem, and I'm inclined to believe it was the builder's fault). But mine is functionally perfect!
My major issue is with the light bluish gray pieces, and there are a lot of them obviously. Certain pieces were extremely light colored, almost white, and they stick out like a sore thumb on the exterior of the vehicle. It's like the dye machine was running low on black ink when they were molding these suckers. Most pieces are fine. LEGO even included a separate bag of 11 1x1 light bluish gray bricks (that are the proper tint) as though they were aware of the color problem, but there are quite a few other uncommon pieces that also share this discoloration. I've never purchased a LEGO product that provided extra large pieces in their own bag; I have to think that the product I purchased was partially defective and they added those in right before they boxed it up to make up for it.
It's very odd, some of these gray pieces are so light they could be considered an entirely new LEGO color. Maybe the set will be worth more as a result.
In any case, great build, impressive design, looks good nonetheless!"
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Off-color gray pieces (only 1 of them is 1x1 brick)