Yes that is correct, 255/60/27 pirelli pzero rosso assymectrico's (SP!?)...As for experience ive only driven maybe 2000kms on them but heres what i noticed so far....
1) I replaced the energies (235/65) when they were down to 3/32 at all 4 corners, and noisy as hell. Despite the rosso's have a higher load capacity (106 vs 104) and a shorter minimally shorter sidewall the rider is MUCH better (quieter and softer).
2) The appearence of the truck looks somewhat more grounded with the slightly wider tires but yet doesnt look like your riding on bloated jambusters.
3) I absolutely hated how the energies would pick up alot of the road surface, im not sure if that was because they were worn pretty good or what but i was definitly pleased with the change, put the luxury back into the ride qaulity of my X.

I think thats bout all that comes to mind for now (just spent a week in the hospital getting a busted piece of lung removed..22 staples in my back and still collecting my marbles). If i think of anything else ill let you know!