I've been extremely impressed by the overall quality and realistic look. I do find opening the gear initially to be a bit of a chore. And inevitably I seem to lose one of the tires, although I have always found them.
On subsequent ones I'm going to open it over a light colored surface in a very controlled area so that when it happens, finding it will be easier.
I also find their stands to be very cumbersome. There has to be something better than that 'rube goldberg' set up with the miniature screw having to be put into the bottom will trying to gain leverage.
Otherwise the models themselves are great.
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