There are tradeoffs. You can use the CronusMax on the PC a couple of ways. First you need to set the "output protocol" to XBox 360 mode, instead of Auto, for either method.
If you plug the QuadStick directly into the CM, then the QuadStick's Mouse/Keyboard/Flash-Drive functions are not available because the CM will block them, so you will only game controller functions through the QuadStick. Many games that support the XBox 360 controller still need some mouse/keyboard inputs from time to time.
The second way is to use the QuadStick Manager Program (QMP) to route the QuadStick data to the CronusMax via the PCPROG port on the CM, then plug the CM output into the PC. The CM is actually connected to the PC twice, once through the PCPROG port and again through the CM Output. The CM's Input port is empty. The QuadStick is plugged into the PC. In the QMP, turn on Controller Max (CronusMax) support in the Misc tab. After saving the preferences, you may need to restart the QMP to start the data stream.
You can use the joy.cpl program, that is in windows, to test the setup, then start your game.
The second methods lets you keep access to the Mouse and Keyboard. It is a lot like a hardware version of X360CE. When you are done, use CronusPro to switch your CM's Output Protocol back to Auto before plugging it into your regular console.
Some games will see both the QuadStick and the CronusMax (as a 360 controller) and it can be difficult to make them ignore the QuadStick. (The Lego games)