Well the Alexanders are in the pre , replacing the auricaps.
I think I have about 4 hrs on the caps and so far the results are generally +ve. The sound has more 'bounce' , better timbral resolution , more powerful , faster and better resolved bass.
Top -end is a bit rough at the moment but I guess this will smooth out with run -in.
Tunefulness ie PRAT have improved quite a bit.