My 7 car set has gone back
The NDM could not reliably get around corners and over pointwork by itself, it had a plethora of minor problems with the wheels offset, too wide and too much lateral play. Because of that the wheels don't pull the bogie around which is necessary to get the tilt and that, together with lack of weight meant that the bogies would lift and derail.
In the end that convinced me a replacement would not solve the problem, as well as the fact that one of the pantographs keep falling apart.
and unfortunately the NDM working reliably is vital to the whole set