It's just the truth. Both my Model M cases, and really all the cases I have, make all kinds of noises when you apply any kind of flex to them.
The BW (keep in mind it's not the same as the newer ones) is tight as a drum. Not a peep under flex/torsion. I took it apart once and it's held together by a ton of screws. The inside of the case is also quite well done... nice PCB (nearly black), lots of supports, and a nice plate. It weighs about the same as the Model M full size.
Don't get me wrong, I love my Ms, and I use them a lot more. That doesn't mean that everything about them is better, though.
If you want to talk about tinny/cheap cases though, the Chicony feels like it's made from a Kinder Surprise...
The BlackWidow Ultimate weighs around 1500g. The Model M weighs 2000g - 2500g
I just weighed them both and the BW is about 4/5 the weight of the M. Not that far off and still both quite heavy.
Having a heavy plate isn't enough to make it better put together, though, which is my point. There is no play, flex, squeaks, or anything that I can observe when applying force to the BW case.
It's drum-tight, uses a bunch more screws and reinforcement inside.
My Model Ms, despite one being bolt-modded, still makes a bunch of case noise and there is some play. I can just pick either one up by the sides and squeeze lightly and it makes the typical plasticky noises. There just isn't the reinforcement there. There's also no attention to detail inside the keyboard, and the plastic rivets were never going to make for a solid case.
Why are we arguing which would win? Both Model Ms and the Black Widow suck.
There is no "win"... Just that the older BW has a more solid case with more attention to detail than any other board I have.
My 87U top case shifts 1mm left/right, even.