My 2000 Boxster is back from getting the IMS Retrofit done. It had a dual row IMS bearing and aside from a bit of grease coming from one seal, the old bearing still feels "as new".
When I got the car it only had 37,500 miles on it (now at 40,000 after my 3 months of ownership). The prior owner had only done 2,000 miles in the last 4 years.