I have used the Ixeg 737 since the first day to my total satisfaction and without any single problem.
This Morning I installed a Thrustmaster MFD quadrant and all went wrong.
Among others I lost LNav functionality as well as Heading preset on the MCP.
To make a long story short I'm afraid this piece of hardware is not compatible with our 737 and must be avoided.
In fact this is nothing but my personal experience. If somebody uses a MCP with no problem I'd like to hear from him. I have made a 70 € investment for it and I wish I could use it.