First - it's a one piece chassis. No upper brace is needed. The chassis is stiff and exceptionally solid.
Second - because of its rigidity, it actually aligns the rest of the car. It's pretty amazing that when you put the braces on that connect the trans cases to the rest of the chassis (and the four screws from the underside) it's advised to start all of them and then tighten them in a kinda rotation. The chassis and braces actually force the trans cases (and thus the suspension, etc.) into proper alignment. I was amazed.
Third - because of how solid it is, hitting things does not impact the setup as much as before. Of course, if you break something, you still break something (
) but the car does not tweak like it did with the stock chassis. Settings remain the same. I don't have to tweak the chassis, check toe/camber/etc. after every race no matter whether I hit something or not; the car is pretty much solidly the way I set it before the race leaving me to make ADJUSTMENTS, not corrections.
Fourth - the stock steering always felt somewhat bindy. The BMI chassis changes the servo from laying flat to pointing down. This allows the servo arm to move the same way as the rack moves eliminating bind. It also eliminates the lack of clearance through the upper deck.
Fifth - the absolute positive connections all the way around. There are no more plastic servo mounts - they're aluminum and SOLID. There are no more zip ties for the receiver pack - it's in a dedicated pack mount (although I added some foam to make it really REALLY snug. . .
Sixth - although I didn't have any problems with the stock tank, I DID notice that the amount of foaming was noticeably reduced.
Seventh - never discount the beauty of a big chunk of machined aircraft (6061) aluminum. It is a work of art - I actually had it in my office for a couple of days just admiring it, before I put it in the car. . .
Okay - things I would have liked - there is no handle. Yeah, it's niggly, but it's still something I would have liked to keep. . . I can't think of anything else. . .really.
The weight is exceptionally close to what the stock chassis, upper deck, uprights, etc. weigh, so that's not a problem.
Just my opinion on the chassis. (and no, I don't get a commission nor am I sponsored although I wouldn't mind. . . heh heh)