Very good product!
I was looking for a sturdy chassis for my TS-XW simulator, which has a big force feedback, and after a lot of research, I found this one.
It's very stable, it hardly ever moves except when I do big counter-steering and there are a lot of possible position adjustments, including for the pedal board. The gear is of good quality, easy to assemble and it folds to save space, however I always leave mine unfolded. I have no opinion on the gearbox plate, I don't have one at the moment.
Very happy with the price/quality ratio, I recommend it!