I know this is hardly a scientific review but on my Pug 307 (2.0L Petrol).
I have had 5 sets of 452's and have recently tried out the 912's, put it this way I won’t be going back to the 452's as the 912's in my opinion are better in the rain and from cold (check my location). Additionally they have a higher wear index than the 452’s (360 vs 300) but maintain the AA traction rating.
This nicely sums up why I distrust user tyre reviews.