[Steve Tinker]

I replaced mine @ 76,000 km (47,000miles) and comparing the original pump vanes, they measured up exactly to the new (original) Porsche pump as supplied by Raby's Flat 6.
There was no perceived wear on the shaft or bearings - but I'm good to go now for the next few years.
As a matter of interest, I can't see why anybody would buy an aftermarket pump (Laso) for such an important piece of equipment. If you only need to replace the punp every 3-4 years or 50,000 miles, why not just buy the genuine article and be done with it....