I've been testing LXQt for some time. It has it's problems (like Chromium problems when maximizing), but overall it's quite stable. The default WM is OpenBox which is a bit more enhanced with Qt extensions. It would be good to do a thorough testing (even the basic cases like window operations, virtual desktop support, etc.) of LXQt before releasing. It also seems that it's not to comfortable with many monitors (although LXDE it's comfortable with them also).