I got 1 bitbox from Stone Age Gamer, and here are my first impressions.
I saw people compare them to the old Disney VHS cases in the days of yore, and the assumption is not too far off. There is some give when you press down in some spots, obviously, but they feel better made than the disney ones, a more rugged feel with better plastic.They also have a more professional feel, as the cart does not rattle around inside the case. The place for a manual is a nice touch.
Note it is slightly thicker than a UGC, and they are more expensive...but they are made in the USA, and I can get behind this. I also don't like how the artwork gets stretched in the bitbox. The case does smell of vinyl, and it does worry me a touch.