I read the threads from the link provided by @rauliruegas and it seems @needlestein was the only coherent poster. Raul is correct - I was wrong when I said VDH has a unique stylus design, but the end cartridges results with the stylus is unique.
Bottom line - what other cartridges state their styli last 2500-3000 hours? From people's experience, has anyone had cartridges other than van den Hul's last this long? I would bet most of these guys use so many different cartridges they lose track of how much time is on each one when they have them serviced.
Personally, I would only send my cartridges back to AJ van den Hul for service/maintenace, for any necessary worn parts replacement- be it stylus, cantilever, suspension, whatever. He made it originally and knows what it should be. He has the last word on his own products!