Just FYI:
I bought a pair of those (for my x55). While it is a considerable amount of money, they do definitively deliver a very sturdy quality product. I thought about DIY, but 1) i don't have so much free time, and 2) i don't have the required equipment to build that so i the price would have been similar in the end (but no way i could build such a quality product).
The only downside is that it is fixed to a specific stick (but you can replace just the plates by yourself, which is cheaper and easier to DIY).
Now, since the mount is so sturdy, you can apply much more force to your sticks. If you have a product of inferior quality (i'm looking at you, Saitek), that is a potential problem: After one week grinding interdictions (i hate PP!) with the mount the soldering work connecting the twist potentiometer inside my x55 stick to the base broke. So i ordered a soldering iron an am now fixing it every few weeks by myself.
In the end: Expensive mount but worth it!