The Thrustmaster TPR pedals are not cheap but that is reflected in the build quality. Made almost entirely of metal, they are built to last and physically quite substantial. They are aimed at people who take their flight simming seriously, not the casual flyer and really need to be mounted on a solid non shifting surface for the best result. They tend to slip around otherwise.
Mine are fitted to a base plywood boars which fills the space beneath my computer desk. This stops them moving around when pressing the pedals.
Talking of pedals, these are adjustable using the tools provided. It may take a few attempts to get them set up just as you like them in terms of angle and overall stiffness which is adjusted using two spring mechanisms at the back of the assembly.
If you can afford them, and want something that is much closer to the pedals in a real aircraft they are well worth consideration. I love them.