Ok, I'll post my experience with the WNG parts.
Lots more options than Renner for lever heel placement etc, making action design easier.
Very uniform and consistent.
Action has a very smooth, controlled feel.
Makes for a very nice pianodisc player piano due to the smoothness and consistency.
Much easier to cast the shanks, (which is lucky if the glue sets before you have a chance to get it right!).
Which leads me to ...
Super glue for heads sets up WAY to quick for me.(Lots of coffee and deep breaths required before starting the job).
Fumes from the glue,(no deep breaths at this stage).
Clicks!-This is the main one for me..The actions always seem to develop clicks after a while from either the centres, a gap between the shank and flange part, or loose heads.I've never had one not click for one of these reasons.
Dark to work on, harder to see what your doing whilst regulating.
I find setting the jack height in the window slightly more difficult than traditional wooden parts.
My overall impression is: Impressed, but lose the clicks