CM9 ICS is very stable. Development has slowed but mostly because all the big bugs have been addressed. The biggest obstacle keeping it from being an everyday ROM is the lack of a functioning camera, but that is true of all ICS builds for the MT.
Before flashing any ICS rom, I would recommend that you do an honest assessment of your need for a working camera. I think the last thing that any developer wants is another person complaining about the camera. I am not a developer, but even I am sick of the complaints about the camera.