NX 2312 What's New | Copy Non associative 

In previous version of nx the sew command shows any angle deviation or gaps between surfaces but in new nx it sewed with angle deviation on surfaces.

The solid body bug seems to fixed in 2312 1700. The only advantage I can tell with this command compared to WAVE geometry linker is that you can copy to a part in a different session.

As a new nx user I must to say very feature in nx is very complicated and unusable...despite of modern figuration of software, until simple and important parts of software as assembly constration and sketch 2d isnt comfortable...